Malicious PDF — malware analysis report

Static analysis result for SHA-256 670f20c32147fe0f…

MALICIOUS

PDF

78.4 KB Created: 2021-07-07 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 089f36777bafdfeee0f30891be1be6f2 SHA-1: dfa61ad58f2d31b7693522e99bc1faef0ab7dc90 SHA-256: 670f20c32147fe0fd94814f7ccb2a9a1611ccfa52c1d310d2c94b36e8c172b13
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://wastran.ru/uplcv?utm_term=woman+from+back+drawing PDF link annotation
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/kijofogeku.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ebd90fe139dab57efb042453bcbb702a/2449420489.pdfIn PDF document text
    • http://ihdbd.org/upload/files/22619953102.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a50b2e0a---13618317740.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/1727898702.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/decaebb52f2b9e01f6bab2be1280cf50/naligeber.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/fegojavimitowewaki.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/detonotokukoluvotedu.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/bosazovu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/36517700766.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/nikosuniwikex.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/jht7nbsnvm56hdalvt5sk1klu8/11210746587.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zibana.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0fvj6401uqf72b3i7qfke1i3fh/99908072177.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/24636nt5b9tss5q4gjuon9qsuu/jokeniwisubovifezum.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a0645f01---31796096962.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/modebedijakaxulozex.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/50cfd6a6a0d1bb149a57818bebb8a003/96367939064.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/wivejoxezuzijimevijotav.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/nerebeju.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/46418b38c11fa56b5a2dc24fe26647f2/welamawigalulake.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/padebo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0e7c2933aeeb68d77cd840bad2b0b8bc/33566330147.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/22033552030.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/16319399884.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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 10688 bytes
SHA-256: 5efb12cb68331f3bd4680715edbbfd72b459e48ba748700884a9ee3082043413
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17184 bytes
SHA-256: d8ff7541b2d5d5878c0c23fa06d268efd51946e20e35e115f07af2a2d5215ea1