Malicious PDF — malware analysis report

Static analysis result for SHA-256 effdd282e877ee9a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2648ed88a77d50aa523e13c26ecef7ae SHA-1: 5f63da6ac3c10e9066b709fe63f1b7800a5a540b SHA-256: effdd282e877ee9a71a56eba8c60077c04d72fa9fb406095f4817f4143a5622e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech support scams or callback phishing. While no scripts were directly extracted, the presence of external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=fear+the+walking+dead+s06e06 PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3dc21821fcb21d47824e6d0df0cb56bc/tisewanumurofidulejezema.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161408e10e71af---fegemeloderaxirufatulug.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/6658116292.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/62482060977.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/ravemofuvowefobi.pdfIn PDF document text
    • http://effektfilm.de/files/file/4101631662.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613566da183bc---napabel.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/69655786325.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161465194dc6c9---gipulikokemixawawubu.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/37160870898.pdfIn PDF document text
    • https://kaparatt.com/images/File/3147392536.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/36665765159.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/68323588183.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tutadoni.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/19466501605.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/018154fdc2497bf3a15c1eb0e32b7ee8/15985042565.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/39542153320.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/20908762208.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/36464958365.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e37691b3e4acc173f71ccff8939b9246/mujuzonujilizenad.pdfIn PDF document text
    • http://rld-carbon.com/file/48701030448.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a125a146---fivapobugejupex.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb16429cb0---52528997288.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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 10852 bytes
SHA-256: defdd6f443cbb4f66f404acb3f33072a743742aca191cc9039a83c0fab4d8ad3
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 17340 bytes
SHA-256: db1e340c0872d2268e6d034047c86d1b451c0523f08064234939702ab4420f46
font_02_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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