Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea62567144aadaca…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 12:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c08b6408ef370bd993a856a03d3db5da SHA-1: 4e06d5c9e118abecf0feff7ba506d7eff3162fa5 SHA-256: ea62567144aadaca55455d99850f73125be1e9174c0ad3fd503246c7edfff8b1
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external URLs, many hosted on compromised WordPress sites. The heuristic firings indicate a link farm strategy, with some URLs pointing to PDF files hosted on disposable or compromised domains. The presence of a callback phishing lure suggests an attempt to trick users into contacting malicious actors, likely for financial gain or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=paid+hack+pubg+mobile PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a3d92bf---9181370967.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/21885550735.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/1854942766.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/faxezidoluxatirixezejebat.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/45496042639.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58960176405.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/79327733537.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34f1c0a3a---nuwibovekutonejeburiv.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/namexebumefewedoramol.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/51604811491.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/28390791158.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/23636990353.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/12764399588.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62003059342.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/zonesenuzo.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/xibuwoputis.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/26846495992.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/65754295503.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qme6pk5phucq576frja7qk1535/sexofofarapagapubikej.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5c1e8eed6549e4194d9dffa1c9fca66f/42132422384.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac631db58---88690588548.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd20e2420---57680260848.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xojivelatiwuderejegena.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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 18460 bytes
SHA-256: 84ceb2bac881400a786aa64a13b76817bac5fda51c66a38644686c8c8ca71dcc
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10824 bytes
SHA-256: 188f4a32d4836fd909b851a7f8600ec4e894d434594dfc3c76a57311f483bc0e

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