Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb6099d4b41135…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 17:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ab680886c959d31454966115cffbcff SHA-1: 76b1bf85074af5b627947f7dfc871433b078e62d SHA-256: a6eb6099d4b41135bb2b8e618e69e6af20986df8a3a75ab4dfcc5daf2817d2ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous suspicious URLs points to a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://miracleschoolministries.com/survey/userfiles/files/xipivozu.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fjg4i8rmf71ojh5aq2h38g1kcb/duzilarodajoxaw.pdf
    • http://aftckwt.com/uploads/file/97522892170.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/26b10b6a80f98267ab3165965e52762d/32943307379.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f8890c85f403af1970e3b89ab3ffb20d/43002352060.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d05b328f7fec185027eec16b285d5a1/nusoxisami.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab658d337---zujafetizitesijisat.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/297112a0a47d2520e0f7318f212191e1/nuxifunezuguvira.pdf
    • https://implant-drill.com/userfiles/file/makujazonidewubi.pdf
    • http://meechoktoolmart.com/user_img/files/52514927125.pdf
    • http://lagostena.it/userfiles/files/39316925872.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9dfb05e92---31996474086.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7ohpbattvq59i9sra8ihoe8od3/4441059612.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f3e5463d4b1b4f0a98c935334d84997/77515663604.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0b7c540---77359152997.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/768c26d6b7f4dedd58b98dde3f1914e5/99923716593.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756efef6a5---18827397996.pdf
    • https://jackyrouxmethode.com/userfiles/file/degarewipotajebobod.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1588b2d6f---makopixetilov.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d1c3104bc949129cc3feee47f170bc4c/tabuj.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/667b33a92cca1188abd9d6cb3abbe741/65646518013.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/00l7f65jcke89c7ch33rv9he42/bikuxixovitulos.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7aff0e5bcfa574d15752dc9757daaa69/bamizakowogonojomob.pdf
    • http://amexeuro.com/an3_Uploads/file/metusifafatolibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=interview+questions+and+answers+on+networking+for+freshers
    • 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_off00011011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16792 bytes
font_01_sfnt_off00012823.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 17792 bytes
font_02_sfnt_off000156cf.bin
8ccd9bed2ca1f662eacb041180302ac8d8c7ce6abc749a123d26144698ef2906
pdf-font-stream PDF embedded font (sfnt) at offset 0x156CF 11028 bytes