Malicious PDF — malware analysis report

Static analysis result for SHA-256 116b2c94f63c168f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 09:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fdf33c28811a0e06b521e7595026c585 SHA-1: a2020948d7f4f937eb564321b51fcdaeb097848c SHA-256: 116b2c94f63c168f9e8a4042e8efd08c64a3f57d9869d03dde75bdce7fe83664
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of a 'Callback phishing phone lure' heuristic indicates the document may prompt users to call a number, a common tactic in tech support scams. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=restorative+dentistry+an+integrated+approach+pdf PDF link annotation
    • https://atamergranit.com/userfiles/file/2968462838.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051714292472.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/75021036653.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0687999097dd1149417b141310cf7572/27411860999.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/d9q3qfjv5oldg5ma1s87l3o983/pexusinirutesivibuketabeb.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gijuvakinomevakuloxa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05d6b3f4ed2eaa90272f2730e0cfa06c/pawunolojufap.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/vegan.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/24115219417.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071d60e83ed8---pemifu.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/kejazejenewozezirorib.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/nebakavipuf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b0332e24---63258722505.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840d1aa5337---9915468464.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7ec22d92---72018696287.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/gagofarulidagoribivaxuluj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f01d66e0c---satiwow.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1d06a53132bc699704ecda1f27167433/81130981041.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a49447b9---xafowanamewi.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/tusorezewolesujuvizagi.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/46571973586.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/60770852988.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527053604972186.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 11076 bytes
SHA-256: 51b6eae9599d0e453d8edce8b4d539a5e46791051271bf118956abb3ea8988fb
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 17500 bytes
SHA-256: e02f6421a62f7867b469f3fff01d719cb9234576a6ee69a3de668956f8ed6444

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