Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a1813ee5e055f…

MALICIOUS

PDF

103.8 KB Created: 2021-06-30 08:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8eea6508a9d4b1d8200e5fb7202232d7 SHA-1: 19adbbcee30603f1b4b1d5e331c3effc615e2a8e SHA-256: a83a1813ee5e055fd8953f825b2997e478e22fc9c63d53c1b4af347fd28be2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the detection of a phishing/trojan signature strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efad631b6e---43337140015.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/osr65bpmc6502rlij968cic3g4/17226517740.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2c46d5c8---91446989269.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dalibodaruranavejasugal.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/42897951445.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dotux.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/beba350dc07b3e0ad39ea9c0313f4262/musodaxud.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/i5c87ofleceg3eoovafcifhhk4/fafudo.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/fidozuramixiga.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/gumuxasuxaxefifefugoxomog.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607557bce262c---82522922897.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cf68452180eed2e63a0eab37434aa60f/88714211721.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d935fa1ca74585439c237e1429a16cf2/48847963273.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fugirawekukijune.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/72dfa4ffc4b3cfe5f6bf7567a0aedfc8/97388146394.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/48027957096.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/kupubegunapijuwowuzu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087740ace014---xanusesometafuxi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4762b0275---44147473880.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26867704715.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/foledagat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+mexican+lagersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5feec5f5744289cb13f20cfe4d6dd389/14191430339.pdfIn PDF document text
    • 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_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 18360 bytes
SHA-256: 99a7fad9c771b9f936925ae6949ea8c25607881e70487b0a17914f5086776519
font_01_sfnt_off00016233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16233 10608 bytes
SHA-256: 3b48a55a66f27bec6afad102c4ea758b41797fb57ba47e86f52afc60fc2623bd
font_02_sfnt_off00017a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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