Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc425ae39a5d24e7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 07:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c11d517aca007eaec6561c10bc9aeccf SHA-1: 23abc9ee33f6a25447c8b025bc41991150c524c8 SHA-256: cc425ae39a5d24e7ccc476987490f890b7da40bcd869d1e2aa75db3e79548fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on potentially disposable domains. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign, likely using T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=cogeneration+and+trigeneration+pdf PDF link annotation
    • https://zniczekowalczyk.com/user_images/file/zelukusovowigevavuminaf.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c669ab7d604---xiziviniz.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fivogeliguzunufaxofag.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23975062516.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082584e63b2c---devuvasurojel.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kagatija.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/fepavarexofapegixa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075cea444fe9---56200496479.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/40543799599.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a9ec78b6---vepovokuzasezapojabaduge.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/liwowifusilulivibu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c770d9acc2---42164224142.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lt5o71e2b3grlrujcpid6ptk5j/xisagalot.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/goferaxi.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/mobiresas.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1e19f34d---kidusizav.pdfIn PDF document text
    • http://www.moyekolodin.com/files/dakomudolefowozopefubes.pdfIn PDF document text
    • http://renovator.cz/files/file/tatosesuwesepurigof.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vaketorovovokapo.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/bijomixo.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/62770196183.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/63898928106.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de94a0b0490---ginobirorolapevejatu.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jimuwimulon.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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 16636 bytes
SHA-256: 81fd2fefe1fed99e764f2afc49b7b65244922da810ff015cd1783e867dbc1d78
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10492 bytes
SHA-256: a70e899b90e247be7dc8c8c84a79c705d4f56464fae3800215e1541ee9c20fad

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