Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbb533d4cb8b95c…

MALICIOUS

PDF

87.4 KB Created: 2021-08-16 20:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4415498ea3423cd31317d23535fc87f5 SHA-1: 99aed457096bd7e3e99c2697b5a08dc14f95d039 SHA-256: afbb533d4cb8b95ca34374b2e29d81481d406146f60719862938741a14666994
184 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. Heuristics indicate it's a fake invoice or payment lure, and a callback phishing lure, aiming to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://infrive.ru/uplcv?utm_term=sap+accounts+payable+manual+pdf PDF link annotation
    • http://giasuthanhdat.vn/Images_upload/files/meburixokixuzatoliruj.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/75046015181.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/29720612669.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cp5v8a3hvo349qc7rrr3dt19j7/kifetuwadupe.pdfIn PDF document text
    • https://drsaman.com/files/kodibosar.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/80710642385.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/12221905545.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/dowagesafinekisubijilaj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0800016ce---94336795770.pdfIn PDF document text
    • https://festacontinua.it/public/file/78103845319.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/geiutuphdg3r3itgbgo4jt5ets/86538349723.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a7523d92fe66255718f06ef7ddeb5ed5/niduvabudizewutes.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/ketil.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/safaxajudokuvaparoxime.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wekoxixuduga.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/rexuro.pdfIn PDF document text
    • http://cartopack.be/Images/file/88801119679.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xasowuk.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38fa1a82a---xirifo.pdfIn PDF document text
    • https://bor-diing.com/upload/files/joguwilakiruzoxivip.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/35384073217.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90231bb7b---saziboleka.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c2daafe3e---89930473365.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zegadedidazovelepu.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/nesikefuremoxasemegulinov.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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 17928 bytes
SHA-256: 2bedc566fcc426db81adc8bc6e3ccd9d78436f951204c4128b014bdd301efe45
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 11020 bytes
SHA-256: d9bcc0eeccfb11a7961373b2f187f068d3bcb95da31fc57a5d1248bca242342a

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