Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad91ca19cfefc0e…

MALICIOUS

PDF

70.7 KB Created: 2021-07-15 11:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f11e90446108df381a7fdb88e1f09277 SHA-1: 4ac0fe708023110f37f9ce1d11f6cbd9d1a7610a SHA-256: fad91ca19cfefc0e768e550272d2661ace4e60ee0adbd668a61931a85164008e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating a link farm and potential phishing lure, strongly supports a malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bangprice.com/bangprice.com/beta/cms_image/file/leborabojiboj.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3e1a3e3ba515d4dfe2cac32dbda112ec/76558271018.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bed31068656e91319a7aa629662c8621/xugarobadixese.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83232c9dd---fekaxaxisatijotaz.pdfIn PDF document text
    • https://rajaunited.com/contents//files/4543242790.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/60d64a7a6cd003efbd0c56149922b3bf/wibawi.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xagefutudalawumabosomaze.pdfIn PDF document text
    • https://t2sc.me/userfiles/zexobewawemibidadawupu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608657df745c9---83987041352.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dec48a918d84555fdaf2a594eef1ac99/7861741616.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ulkd170c8pcsiti9uja8vdful6/bagepujimatelotexozuri.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/459ueuf3up8vhhbvnalb1rfqjr/bunam.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99378a7ba---widapezenukuwozuzokenelu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/34283024047.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/179e68d65df8376145ca4f91bd192a3f/pugorubobovuwenaworab.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1d1c9ca76f8a2577d62446ea36de1ef8/31471944099.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/9073046261.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076072843624---jidukejiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a130273cc5c---paritiwep.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/acd48cd8de604f87958936a3ae832e34/pogubekimulosuzi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c991e4c6d---38599208236.pdfPDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56a4054ed---61072206246.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/vadixupavodiliturumit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=operations+with+fractions+examplesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B0 10956 bytes
SHA-256: 81f43942248bc57969ffce811bed30dd08b92301a180d7d14a53da7cde93a21c
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 15516 bytes
SHA-256: 9e4dcbd76c6e78e62279a4f268de17d0e6890dcc031bcfad69d7e2194a892384
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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