Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be67b1f139c2f3e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddc0eb6a4e8642c4cf5fd2c89c9dcd4a SHA-1: cba19be1868b9015a4b1d4cdcb449d583aef81d0 SHA-256: 8be67b1f139c2f3e780f3427ab2ca3985c0020dcc8f4001ab37a8319d930f6d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a PDF link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a pattern of asking users to call a number in a context of urgency or dispute.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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://synerhu.ru/uplcv?utm_term=phone+contacts+apk PDF link annotation
    • http://iiiemjobs.com/FCK_Editor_Images/files/guxoduzufuvar.pdfIn PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/dopusoworenoxikalunegegin.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nigukew.pdfIn PDF document text
    • http://jfe.hk/userfiles/zajerowelore.pdfIn PDF document text
    • https://armenia4d.com/contents/files/7758978828.pdfIn PDF document text
    • http://ge-mak.com/files/44594899231.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139d17dc8087---kinekoxo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/36677291856.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/36685497948.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361304ee039---51303905386.pdfIn PDF document text
    • https://koratspring.com/upload/file/dakibirube.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/80719095316.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wologinakonegipugikebuk.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80067098209.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/10567635232.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1c48d5e7f39e6776a88736ba45fbf/2698942650.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210903_7ABDA00D177D234B.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/071951404090.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/47707626833.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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 17660 bytes
SHA-256: 687291d06822dbd7b63b0e7f14862b4c24c1dc76c1b282999f3221606cd51a68
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10324 bytes
SHA-256: dd301128484f1a9b7a18c7944f7fca28e545ec6e53330d4f50f4eb04cd7a1faa

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