Malicious PDF — malware analysis report

Static analysis result for SHA-256 8136a5b69b2dffa2…

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 10:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3e2501fc33905575f78d72140c373ac6 SHA-1: ebd97e823330bf57c0fe5cc27668ce0ad78d24ab SHA-256: 8136a5b69b2dffa25e20fe4eabf1361bb4ed7931aa79a198c096a01d738fa5c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories. The PDF structure itself is simple, with no executable scripts found, but the presence of multiple external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://bikeid.net/ckfinder/userfiles/files/wexodimetig.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bodatovatinimiloraxiza.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094742985a69---vowimake.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/92319277854.pdfIn PDF document text
    • https://mytopics.it/uploads/file/80696162716.pdfIn PDF document text
    • http://geose.ru/userfiles/file/45389756232.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ula7apuftbr0vjm19v05ep4mcg/sadusisu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2e1c30a4---49229001591.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xilujafafa.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/sqaj24681jsig4d2q2u8hb377n/4341477140.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34e4766da---74607816418.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/23855078080.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609760f2e3594---22921837942.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc76ad90e2738fa502eb15b2c1f6f6e1/rebawovegabewam.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8541fda4dd52fa154b93539ee2ea5502/17723249435.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sosolareramufufezotune.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a995658d66b---kabidusaxebikenalanamebok.pdfIn PDF document text
    • http://amandamaitland.com/images/file/13134939884.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf1a6d7852---83893232686.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/456fa0bdf0bc76144a38b410d587c6e7/zoximafitesun.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894bca092b---pidakes.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/57944054509.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c5dch6k89p03hi4ltsmpab45s8/46283860719.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/garigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ramayana+quiz+questions+and+answers+in+telugu+pdfPDF link annotation
    • 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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16880 bytes
SHA-256: 9e186c5a1e21949f0757ba201a6afd4336fabde2f137c5176ecbeffdc1625e10
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 11392 bytes
SHA-256: 139a322fe7e6dd4e8280971fe50033998931fde1568bb5a8d425e0cfabbbd485
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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