Malicious PDF — malware analysis report

Static analysis result for SHA-256 875120aa219f8406…

MALICIOUS

PDF

96.2 KB Created: 2021-07-05 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04f2adc0cf890e5339a25ad87378c823 SHA-1: b9715c6325eec345aa294a89868e2c71e941d99a SHA-256: 875120aa219f8406216565bafd5223a368141e39badf4d6f90897bfa95a747ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to host or distribute malicious content. The primary attack pattern appears to be a callback phishing scam, leveraging the document to trick users into initiating contact with the adversary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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) or Microsoft license-boilerplate 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 http://www.anjhimayath.com/upload/file/fixilabujabomuvekadiwiwog.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/27168203425.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd750c572---8066026840.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/ziligarare.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c504e1ec045---25185747869.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/btputpsgokltmjsf6ig6gqg8t6/53500557825.pdfIn PDF document text
    • https://signika.pl/Upload/file/83880078329.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/poripesodejozexuridivut.pdfIn PDF document text
    • http://maihome.hu/admin1/file/17523980429.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27bd19845---39531900041.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/adcde41a1cbb3ce002614dc4a122518c/teditur.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ccd19a38---91710306275.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/valoj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e113ec2f---toriperosojopuderuxajag.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f3442e96---35732916148.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0b3e1462fd030d634efde50f304c116f/31949036152.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wudoxin.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wepewawenig.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e663a683c---jesevozazibuk.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/90729610212.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/rujubodesupumemow.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/76636202698.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dakikutovipif.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d0f2a69ed---41567614994.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e65o543vi8ai5jrhk7iniea2s7/27002776233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=video+in+indesign+interactive+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 18264 bytes
SHA-256: 4997bff9d701a3f5c7d52f8a56ef4a6eaaf7c2f43b919cd6b7b695c985b3115a
font_01_sfnt_off0001423c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A53 10784 bytes
SHA-256: 50f4488e319c7e9eca70a599b324d2a27a50ef332056f11480cdc97fbd4220ee

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