Malicious PDF — malware analysis report

Static analysis result for SHA-256 4751ffe311fc57a6…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 03:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52a2f0f09f26feed2a9d6dc94b45b25b SHA-1: 7f736d0b0c2ef6f6846786fcc68a15034b1255de SHA-256: 4751ffe311fc57a67624263dde1808b7a051c6473a1f8bfd9af1c37b116cb726
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate these links are used for SEO manipulation and point to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fotofolliasanlazzaro.it/userfiles/files/50552526069.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/99778414608.pdfIn PDF document text
    • http://juha.be/_files/file/mibikazumezilitawaxoned.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/didiwagogujo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pezefene.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b29c892e1a---sofanop.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/kitagomi.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/bajutejazepijenofumo.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/basoravejalikof.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/guzijovubavedigev.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xokofuxan.pdfIn PDF document text
    • http://kim-clark.ru/files/file/zakonaganikudemunakenar.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/gisujulitiwisoj.pdfIn PDF document text
    • http://intersonik.eu/upload/files/girumefesakogixubiwaw.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/jakam.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a7luuokp6i315jmoec4ifebdhh/53897561578.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/jiloxugere.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/kujizafoduxa.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/65691653426.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pavitujenizufafugazesopax.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1e7aa3b6b---5224576809.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/jizobulasuxamas.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140306352d40---budejomosujevo.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/korabopejogutuwiposu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+phone+not+sending+messagesPDF 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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 10776 bytes
SHA-256: 5369513b6fae3ffd9bb8c239acb0afc38b3b7e580ec05be05e56d207b34525d0
font_01_sfnt_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 14740 bytes
SHA-256: 8009ad388b6c84f466c0881f06f36330c2c1b7443a1f18f8739fb822df313aeb

Open this report in the interactive analyzer, or submit your own file for analysis.