Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd79d21d2ae28d2b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 19:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32515e993e8333e7b83fd25436152303 SHA-1: aa793c16ee807fd2bfcd538e672ad92595af193c SHA-256: fd79d21d2ae28d2b73bfd1752ee1a1aed66ba30b5a9e173bd569ee9c4b78b807
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a link farm with UTM parameters further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=android+volume+mixer PDF link annotation
    • http://ciaomamma.hu/editor_up/71567882087.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/98391656460.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gezeradovotitusod.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmndmmbivc462f4ppjctn85q04/30172553671.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/narotusimusuxamefito.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901195825.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/runubusozavofog.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/legexulo.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/jarevuzo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/60d91a32cdcf630fd3d0ceaac741f63a/69874613274.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lemamevulowabuxopop.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/mibezofitejed.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/71258375072.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wuxanilezojibizuzori.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/45161718319.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52c28ddf2---1029172607.pdfIn PDF document text
    • https://cecprint.com/images/file/sowavatidom.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/20009632208.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vuvukexiriwuje.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed913cf5e1---68994489824.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6f907e87bb0dc131e16a4ee5b8528441/17800485901.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/32281231387.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/39465904640.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/tiwimiremit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16912 bytes
SHA-256: fca4dcfa9eba74bb083e644b517530c07edf3c28d16146c844edf00302c4b2c8
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 10232 bytes
SHA-256: f72f20dc00c75446ba4815d913012a3f42b3c8624b372a6a45b55f7d48dc13ca

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