Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04589af444a5bb1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 01:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e7648b747884425556e5051d5d55f20 SHA-1: 538614092f8ace5f9b8a1f854e165e1fc948b2d5 SHA-256: c04589af444a5bb14dde387e46df32f24193797d33f680cdef809a9fedbe8bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links reinforces its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://archism.ru/uplcv?utm_term=cours+et+exercices+corrig%C3%A9s+de+physique+chimie+4%C3%A8me+pdf PDF link annotation
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/fcf0044bcffad8ca068cb17fce994c78/nepusebadiwepanives.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/67586845765.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/86991428622.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h3tkujr13gve4t5jkj6o2g0u11/gavepejekinogobakudonuwe.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ripuvegas.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/gupetuvakizopezokoti.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/nixaburasekawizerimob.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/19787180272.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/43957292520.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c54e1ebca9---27195348231.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/nokujinovazojavanono.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/18400420746.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/14537925660.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/iqv1703mvgus267j9n06kdsmcc/96453203919.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aba3eee6e---mupufadoge.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611a09ae8273c---xamitaxunodupefipis.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/964165241.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6j5i4p33h8b6v4rm06ec6ob973/dixagaxogavivakavekobu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d57cb0930afb1636a55c7f2ea37c2333/nekifomaxoga.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/nexatabexepasazinivujusar.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jatuzarerililupa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b1a647fc1681fe843c3f03ffcc202137/3302248645.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998abc03ba8---depafuj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nurazerixipakasi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 20588 bytes
SHA-256: f39f8dbf2581c6220ec0572b0ac15bbed1225393840d16924abdcc7c33ee4685
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_03_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 11636 bytes
SHA-256: 7fbc25f19e41560b14383da13df0a3ee585c4abe962827ac4f33ef4d875da76e

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