Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1fb1eb10a7303…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 08:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6d6d661d80e6f56745ad8ce8a281340 SHA-1: 79e442fd539f81798eb011fff7586255ccd346f4 SHA-256: 88f1fb1eb10a7303a93e5b69797f5528b5590dd2bac7036611420efc7bde40ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://rnralpha.cz/res/file/maduxeravejosuwufinota.pdf In PDF document text
    • http://peter-crooks.com/userfiles/file/56847324034.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/40294985796.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/64005299155.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jutoweguzowab.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/dirujude.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/wizoribiwetexojefowomexev.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/67393381435.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/deden.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614931e7c40f8---26700093327.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/46336006084.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913110218983686.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b2ba1c9264cf49256008f7f3b91d18de/ribogolorapijirasaxowal.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210912090801627145o0wzw.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/59360100120.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9f575b690---96882757414.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/99196496049.pdfIn PDF document text
    • http://btfa.tw/upload/files/wotazovunibififitevafek.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/nenaneboduri.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/81653091578.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dbde23b1c68958508613b8ff8199382d/doruwusumiposibadesave.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/47756281820.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109170433087172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bloons+td+5+360PDF 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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 15172 bytes
SHA-256: 6e32139a88104a144f43c5ca0e300f194e0b99e6ee36f0b14d07ed1a1677ac1c
font_01_sfnt_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10404 bytes
SHA-256: 3b66ca8c9459e094fe720677504990be41c6b0d036fbddccbe8c081cf59a74a8
font_02_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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