Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cdd1d40c019b6f…

MALICIOUS

PDF

73.7 KB Created: 2021-10-03 21:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d41d57d61f3ff5d7f169bd063fec3c8 SHA-1: f93f8271fbc56c5c4e2f5f117aba613a421413e6 SHA-256: 42cdd1d40c019b6fea6fbdcc176ae344bd0ec618e37ab58269dacf6e8909bd39
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, suggests a callback phishing lure, prompting users to call a number for fake issues. Numerous embedded URLs point to various domains, many of which appear to be part of link farms or hosted on potentially compromised sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=credibility+meaning+in+tagalog PDF link annotation
    • http://findusafranchise.com/files/files/55943465121.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/46065721811.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/44719149223.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/zuponew.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/58088712589.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/15728386579.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b64c6b899b---63552763983.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-19/20210919232247703153.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/89655475013.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c971bbccf6185f3695a93dc0e9f8db15/64332853789.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/41288281704.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/36005380819.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/35264889315.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614374e03e522---63970094875.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89c55123e---lilubumatopalebowabi.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/24837554407.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913015383316.pdfIn PDF document text
    • http://wsm.hk/images/files/78342094705.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/40117203522.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gelozirudatefixadomixizu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/rukufepi.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/notobaruviwovojimozaki.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23463530346.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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 19140 bytes
SHA-256: 39c553a1ff218485d18f8afb6691649a139453b78baff83724ee87219826e3a4
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 10708 bytes
SHA-256: 5f16926977835e7505d34c6dabbb81e81d7e19c65c60b84f544d76c40671e1ac
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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