Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e72a85aabf368b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fce306b57ceaaf3d898d161c389c23a SHA-1: 0766f38027f4fa1da2607791e92e609391980287 SHA-256: c5e72a85aabf368b6ce40aefdcbf23aac202738b7b97f146243f464527ea5398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It functions as a link farm, directing users to multiple external URLs, some of which host further malicious PDFs. The presence of numerous links on disposable hosting and compromised CMS upload storage suggests a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ndmoyun.com/calisma2/files/uploads/vevigupazelomud.pdf In PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/34051887990.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/kipemuzuderoj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5db3e1a6---rekedojasizutukamomaneb.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/futidotufijuzugunapo.pdfIn PDF document text
    • https://nistd.in/userfiles/file/823160244.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/buponune.pdfIn PDF document text
    • http://onlinevay.com/upload/files/66935634197.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zazedaguvugugoxedobo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tekugulobujomuritapere.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/80451923363.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/netibiwabiviperogumakox.pdfIn PDF document text
    • https://mikludava.lt/images/files/tadefowaribojesu.pdfIn PDF document text
    • https://rm-parketi.si/uploads/28404382096.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/74268973983.pdfIn PDF document text
    • http://finchamauto.com/pics/kabaxorux.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/80011473844.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86051405155.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910224758.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/35253788037.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613655136e481---femijenuvidibapipo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d1ce65794dae6e2635315b64ad301d2/93309723869.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/rumesitu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/luxumomitutasusolikijefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mature+granny+lesbian+pornPDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10772 bytes
SHA-256: 1571654d4007c181885cb3abc604f562430d6d3e1a9aa93bc7823b5a54351a24
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 18252 bytes
SHA-256: 6d36a1750069dcd15a6077b7c27731e5d734ef61fa38359b598822de7fb5a699