Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7a22b388a54ec7…

MALICIOUS

PDF

93.0 KB Created: 2021-09-05 21:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 834b76c0bf7baef6fca8b3193739c061 SHA-1: 1a83d6f9a0096f4aa5b3ef808d8bcadccaaa20b4 SHA-256: 5d7a22b388a54ec7aa7d4322d561442c7e4bb7f067cf4b1f1b54d83e519dcad8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The document contains numerous external URIs and links to potentially compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pixomot.ru/uplcv?utm_term=toltec+wisdom+book+pdf PDF link annotation
    • http://pfmconsulting.org/survey/userfiles/files/27468465881.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38787329680.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/torug.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d935f6ed87e9e3e6a4195ef3d1eebd12/71405735666.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b737a452---tatokagutemirotiwun.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wisixekupatetiwomoxusozux.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/24847481402.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af713a80270---rumupafepivanid.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bb13611bcddda1d97a11ada998c7d637/liruzozutefa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097273320728---kugofawusobowabuxenalit.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/41922678696.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/vitofezasonepubufuz.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/jadofuwosuw.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/44350346281.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fb1pl721s5kemj2hh6gmc06ll4/51732342881.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/jaluwobinili.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/nukibepazipemuvasabijuvib.pdfIn PDF document text
    • https://vleek.com/uploads/files/43049239416.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/bividirikeditot.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be704658384---nubebonerajo.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/puvebi.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/wizupos.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814cf276d38---mejudexejomusaboxive.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_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 18084 bytes
SHA-256: c829990b4595bae8461ee305a57226cfbe7fecca9cfc909dc8f2004f40c6aecd
font_01_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 10696 bytes
SHA-256: 3dd99cf3f871f07aba3646f1600f5e26348b949ecc337e890c47183f902ce9d0
font_02_sfnt_off00014e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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