Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27db93944a6755c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 16:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c7d138ead1a343d22c3c32afc0fdde5 SHA-1: 22b50f4a6eab32ede3af7447e2c6008038068fc8 SHA-256: d27db93944a6755c89dd2ffb2c46866234112d3ad87b12d3eddcb7a5f78ea92b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were extracted, the document's structure and embedded URLs suggest it acts as a lure to a compromised site, potentially leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6ol83at38v1gtt0s5njdieust6/71496167221.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd53fb9fb24---nabalejawomamukalagax.pdfIn PDF document text
    • https://rcot.org/userfiles/file/fulejumowugufajako.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rdg6o8g654u6scim88fse7p1vg/juxef.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39017e31a7---gonomikezavodiwiwuzis.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb070af9a4---sogisibip.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/39351551431.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8057065e---56321142321.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/xesetag.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/begulanukovo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf94fc9b5c2bccf4027b30102c3ed9f5/72203290489.pdfIn PDF document text
    • http://djpress.pl/Image/files/18247338747.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ad3942981458e1b9b46c673d81849a52/pibolewavanilobopozi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8e0540451a30cf27731e48173a6206b1/24436440970.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6521c530ff---22385000652.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5ae1190---53548808217.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f58f0ab5f---54328485960.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d0d9927b40eea592eead309821d4bb4c/1628108116.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19153b6736---56757787072.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/aifjr999pdi14a6ra3i22vt02o/dugefovina.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5bbd8ed02---giraxurin.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d7005bc4---malob.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ef15fe2f---87074245840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+state+functions+chemistryPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7c76b6e651e2df0e4d49cf6d24ceb8eb/dolesulotodebise.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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16912 bytes
SHA-256: 868a87f0b22b7243c2ef8454ede444ec148d31a0c93235887f1c932e7c4413e5
font_01_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 11044 bytes
SHA-256: 32e60c2ae2d3082cec5ae5d5a1edbb43deca0c6c31d4120ce7b3c82aab19ccd2

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