Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e4b20ad9d86af…

MALICIOUS

PDF

75.7 KB Created: 2021-08-22 07:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f744c4ba04c76c89985f37d6e588bd5 SHA-1: 016e1d447cf7039d122ad38871743e16aa78cc37 SHA-256: 891e4b20ad9d86af87cec917c3eff67ea7984384443f9ac97faa85b7418110a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hvpeds.com/upload/contents/file/77691853886.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fb37aa0fb8f5ccd75d8e543141dfa1d3/64095662317.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7f0ae87a9854b21be371dafed9a1dad7/pinaxinewex.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117458750400---44705290705.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ce2886f17288c715ee5c3b5c86f6c37b/29009046300.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f146ba16c6010411dcd252b2720750d5/56934019522.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/6539641084.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/sipil.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd03498d0b---redal.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1964fc1b79---57669682037.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5035ef3662---webeb.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f36c300a3af168165dc5a54c34606475/38640906515.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/41604818201.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/waselizenivunolomewaw.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/63840680264.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/75125226298.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160773587576ff---77790087565.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6025f7f71670b74ee63ed17249f9dd85/61055154862.pdfIn PDF document text
    • http://altinay-law.com/images/file/dozegifabogolopobem.pdfIn PDF document text
    • http://toroisg.com/public/images/files/20208810936.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/dowanogaki.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tekureseme.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7db213027a87687fdf6ea300c8313eaa/zuwojozixaminonira.pdfIn PDF document text
    • https://allianztc.ro/files/file/sazonifofomusatenurow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=where+are+belgard+porcelain+pavers+madePDF 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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 11060 bytes
SHA-256: f91b600187e0f971e2b7182caee2fbb710b7c1e1c31a0bbd02f1750ca4f7823f
font_01_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 16596 bytes
SHA-256: ed78e8047d912cceac8d03b3cb78f7c79da54674a3c8a7ccfe42fde380ee1f1f
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1