Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdc12e7a0033576…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 19:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0c95cd6240622efd9836421a97b92158 SHA-1: 5466d4deb0508eb15930a1f836a0e4fae63e67c8 SHA-256: 2cdc12e7a0033576fbe5a1c4a633dd85df9b409a61be1c6bd0a237bf98f28346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF structure and embedded URLs suggest it's used in a phishing campaign to redirect users to potentially malicious content.

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 https://cructi.ru/uplcv?utm_term=research+and+development+management+pdf PDF link annotation
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p64utvct2j3jhrr0o1ivtsbnod/kevodovarawibufasewos.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/safiregubepemuf.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/3381043517.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/7540541793.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/77289257047.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/34763708538.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kusesiboresip.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kopipazefenarirotazazi.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/davupegizomobasomujupave.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87259796135.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161321513d7679---84695691913.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dotusipuzepozuveporobe.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/gagoporasejez.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81966098932.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/talapavuxetejinedepa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60ce21457---61588275923.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161516af331a6e---1592784929.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/11533484537.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/41549681120.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/27487956060.pdfIn PDF document text
    • https://olterus.info/contents/files/8633034917.pdfIn PDF document text
    • https://shevian.com/images/file/gakod.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/tolupinexemipovolu.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/36864081448.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/refemi.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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 11084 bytes
SHA-256: a226e0916d77169a7ec1395c904f3e4d39d1f380692bbabc292417185240635e
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 15460 bytes
SHA-256: 35ce12c8f942fb586d6984b3500c8156cdcf4eb33a2ba4cbef1a62f27a45a7fe
font_02_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1