Malicious PDF — malware analysis report

Static analysis result for SHA-256 12216bd3cee1b581…

MALICIOUS

PDF

111.2 KB Created: 2021-09-06 06:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b817b42f013e9d0f44e9d1f7b581b621 SHA-1: 786f37a8c5caae2d710fd5f2b298c2013f7592be SHA-256: 12216bd3cee1b581da3af7529c98a4795190ac3fdde12d74308c507537d2913b
216 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts users to call a number, a common tactic in tech support scams or phishing. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score point towards malicious intent, likely involving the distribution of further malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=ford+fiesta+zetec+2012+manual PDF link annotation
    • http://wccflooring.com/userfiles/files/89994231586.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c54879f3d---59155892023.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/16484543098.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/fukokakesizomimuworofi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/videbopalekituzaruxi.pdfIn PDF document text
    • http://tfforming.ru/d/files/povokivijubaburokijebem.pdfIn PDF document text
    • https://samtee.com/admin/images/file/zurobi.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/mitepanonifotal.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4469c2975---vunuzegu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3e6971ba642d6f4a17a44ce3621a0a28/jimud.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ce6k0h5btc2gk3i3j6fpob95sf/99159493202.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/74127340719.pdfIn PDF document text
    • http://ahchala.com/img/file/55347240034.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/wofaturokudobonedodozozo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cdepbs04d3gq3cfb7c1mjc4m64/46322103048.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/wojosam.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/mirezox.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/20958954064.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/saxiwizonimufujopajowisu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/rotalopifolidarulet.pdfIn PDF document text
    • https://jurad.eu/files/file/36980542320.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_off00014d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5D 11068 bytes
SHA-256: e5acc9c0b794b400b4513136238c4a6cc7d97260ae0929c8c019131c9c8f059f
font_01_sfnt_off00016740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F52 18352 bytes
SHA-256: 0c164f2f1d141eec5be58d2220c7ec6cfad9f24c2f5e6489d2c747264811c863

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