Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08d4b6c79d30ca…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 02:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a09e76cd1c2293e7fdfc1dfef918e980 SHA-1: a8dc041ededb27b6603ba54178f2acf39f03cffd SHA-256: 6c08d4b6c79d30ca7b1827974e768af86205c3a7d5912222cac25cb3c594fb56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=copying+is+the+greatest+compliment PDF link annotation
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/32b98e5cfd23ef99e9592e7b652f5225/mifawezuwin.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xidewivujubavivapuda.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8e380c1bc33c59ef8ac11d263b14029e/sujiwodadidi.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/jomopatibaxasonezaloxav.pdfIn PDF document text
    • http://land89.com/ckupload/files/61432530578.pdfIn PDF document text
    • https://arerp.kr/data/file///vujubikabewiwor.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ec7e72be321a4573ab4e92d041ca979d/3519239736.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160959adbb3cdd---66685081647.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lh5p9cdrircs7sphru9vskg2hu/17907286664.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75277405487.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd8f00cab---livemumukejasukinufotili.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/71jq6cgr6dkfv2blc00voefph4/mawobinokapusafufaparufu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/60iq6rpokdm9ghvnabvorsil84/xuledefavopax.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741c5194---sibisebuzusobuzimegaguje.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nv91a4rb5tv2gcs1e1247k811h/nopelevanewizozirexoduz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60da46196---nerurekejebibadosepagefow.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/29740464035.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210630094314.pdfIn PDF document text
    • http://wenxuezj.com/images/File/62528016380.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2ac7271d---valenijipinawepu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/9858930448.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1282f1198---gepunamifam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10968 bytes
SHA-256: 7975e1bbccbd673deb4e69bc4e848feed5e83d1f2e6dde6d7ee009e5599e77a4
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 17176 bytes
SHA-256: b6c9c3fcf85606a7bb23b903d2122da705c24924b80b7e7cee128211f447485a
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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