Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bd16918d3b6e21…

MALICIOUS

PDF

81.3 KB Created: 2021-08-24 15:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49c99e32813e77cc1dca9311d3dca27c SHA-1: ffc307f48fe88996c0349604e2033d2a706dd750 SHA-256: 62bd16918d3b6e21ec7da0a782261ea4e2a078e62e15b8bc5afd26d809882d54
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=analog+discovery+manual PDF link annotation
    • http://psychologadamczak.pl/userfiles/file/3809661715.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/guvuw.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca43c6f5b8---53749024711.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/dipaxoxumimisad.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/jufunemebuvuzor.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/79952360050.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/bitiwifim.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v91d2j5gv5m2cdv4hrq8r5b3j0/tunojizalebiwiwa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160836d4a80f2f---84561013675.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/52621655568.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/jumokiwetawib.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/63370840234.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/51342458c7bc075d1e9e6eb1bc1aa425/64309275832.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9053b99f33e6b3a2740f9743cf4311b6/ligod.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kefevomuvepodejufev.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/40106876426.pdfIn PDF document text
    • http://cpils.com/userfiles/file/97898571680.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/zexox.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10876 bytes
SHA-256: fb621e597ffc192a8d828c3ae2c28771df151237e1e178a2a2fc7801f5cc4264
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 17060 bytes
SHA-256: 555aaf159743a7684d94d3df6049b96ae374aba4e04ad715b021dd72233561ef
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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