Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d06be9bff326ad…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 06:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cbb237642acb59593bab2ab2c91bba78 SHA-1: 970becedf3b5680be6ba1e1136adf9cb680afcae SHA-256: 51d06be9bff326ad78bcbcc781d2c322866c9c4724aa4c82735a3f6f1f459141
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a raw IP address further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=licor+43+cocktails+pdf PDF link annotation
    • http://mamnonlittlesun.com/upload/files/1367163059.pdfIn PDF document text
    • http://ippon.lv/uploads/File/19899546923.pdfIn PDF document text
    • http://terminsk.by/pics/files/ritepaviru.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/vaxixulolamulo.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/mozesuwemimomazukobamiba.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/6587966033.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/j6qhrdk6fdqopag7ua1kf2ffgj/rudadezemufewigo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xomoxoxexo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1640da59---gurolezamov.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/pigasireketenokakuvewuz.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/darezovitugaxewizar.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/65785700013.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/59182922067.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10333488740.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/rukaxaxe.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/90774705064.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d7095b2497df96677029124c47886b24/41687624725.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/84b07a489ad1b58e88b44f8f0c3dce00/55420956707.pdfIn PDF document text
    • http://50.87.25.18/sites/default/files/files/zoxobulorelutuzisuwuz.pdfPDF link annotation
    • http://residencelesaline.it/userfiles/files/nekeja.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dasosumipesuxalise.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sevoderubofimowupevedajuf.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/sorukawa.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/28253076174.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9982005e65efd1ad896afeccb7638d34/32070049079.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f1761eed5cf217bd8572fb5567b41524/fovov.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fodawaxitifoxego.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 18576 bytes
SHA-256: a3ba92213f331a09226abf24a5cf1b7c420f38699bf4b54096e9dab2f3bd18d8
font_01_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 10676 bytes
SHA-256: b00dedfe8d6c3fba38f2fa229f9d36df1a3c760306c431986d17745b15140d8d