Malicious PDF — malware analysis report

Static analysis result for SHA-256 332bfc3809676230…

MALICIOUS

PDF

80.9 KB Created: 2021-10-25 23:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7294d9338ee539d6838ec621962552e9 SHA-1: f2934ac99e01725daead25ac4524edc22c1c782c SHA-256: 332bfc3809676230a198d637702d31eaed2aaef4c513b48a105a4748b2c035da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution PDF. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to exploit users, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://doudou.tw/userfiles/files/8384038910.pdf In PDF document text
    • http://ryukatsu.com/userData/board/file/mawupibusoxerojopepabiz.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/tobivanunupanaziraso.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/38924602181.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/89056713275.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/45961480631.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a4c285fbd---42985686949.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sigasenopuloro.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2l008qjro62l78iutl7b8tj5sa/zatogaritasatukobosowej.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615dcb0aa0b6c---81176837106.pdfIn PDF document text
    • http://taigesw.com/upload/files/nasijojalurezujikez.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/dokotogegokajirin.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8b2f5182c5658315ab276c21efa85706/34403065319.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8ns419ul6gvlrljro7j5rjkdl3/getefe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0b301ad1b1446674fc1357ed8989b2e0/29094991809.pdfIn PDF document text
    • http://ave-france.com/pics/files/22908934117.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4b8pqfj0p6qdb8h3rsn80apg44/79767119922.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/57818303509.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/16672998677.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/rimizeledu.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/korumuf.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/jixijafuwakozekiwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=types+of+ore+mineralsPDF 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10496 bytes
SHA-256: 483e77179aa865ff26c5dc970fe2076600790fe14dbfc87522fb096bf940e706
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17536 bytes
SHA-256: b2e7921843fdcbca03ddaa95015a86ca044585e5a6dfffe47fee93c152528a19

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