Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9745582a2a6c7f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 12:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 623cb0d8e16aabeb1570d731b144e82c SHA-1: 79074fcb3bbd134dd73f0d0d0b30be86c4dd0001 SHA-256: 4b9745582a2a6c7f657f8dd5c01837db9029b03a178dcc9c545d99744434f7d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS uploads and potentially malicious content. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://jerseyshorepirates.com/userfiles/files/97799840172.pdf
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/75444499392.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/33b15cfd6272f697958c513188e84724/tezujes.pdf
    • http://gainliving.com/upload/editor/file/20670927930.pdf
    • http://ttlh.vn/storage/ckfinder/files/gizumuwefibez.pdf
    • http://araulmor.tel-cor.com/images/library/file/zipugemebepavox.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30ec5f2d389836bc0bae0cb945add982/xabakemugiwaxaf.pdf
    • http://leprofit.ee/cmsfile/contentfiles/wijuwijepoz.pdf
    • http://shceping.com/upFile/photos/2021-9/file/tuwov.pdf
    • http://vipnjl.com/userfiles/files/73066182642.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d71a97333---koxetonizive.pdf
    • http://geoplan.su/userfiles/file/89020332845.pdf
    • https://makanbanyak.net/contents/files/sojakipolarun.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/77005895661.pdf
    • http://caycanh.vn/images/fck/file/wivelogoxunubavidof.pdf
    • http://kerekesvillszer.hu/UserFiles/file/nibawutu.pdf
    • http://www.siposferenc.hu/html/97344430758.pdf
    • https://chrmglobal.com/userfiles/file/xetigepukatopeseza.pdf
    • http://kopdesign.nl/userfiles/file/zumomabozuxeduko.pdf
    • https://trongtrucsolution.com/uploads/files/56967771786.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8ca7568dd30ef3a2b5e0300c2eff15bc/4597885523.pdf
    • http://oasis-inwaste.asia/files/file/jekegovuvukejom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=layered+money+nik+bhatia+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b111.bin
90bf26925308f092c29422e09fbe3a9ebf3b34578013541d887a34193480be31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 10852 bytes
font_01_sfnt_off0000c9ad.bin
8119c10c70f04bdbdba10bf8c2811c4be99a0f707425e3db816e933d06887d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 15848 bytes
font_02_sfnt_off0000f096.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes

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