Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2ff3f33411bb3a…

MALICIOUS

PDF

91.3 KB Created: 2021-07-21 13:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92b125ad5fcd1c73e99b5a736bca1c55 SHA-1: f7f85ad5e8b2443d683d8d6ca3cc53f95f564e67 SHA-256: 7c2ff3f33411bb3a7695cc93c55a62fa5d7c1b4fda56c3b68f7ca271b43af4d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ikoi-es.club/yamituki-n/uploads/files/2534999286.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/keu1nb4vni6j2rfmnk7saqfops/vabibalememikibagowu.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/xoxenexa.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171f0dcb2---89671897964.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b441cebd4972e0964194e36f9135bc6a/lafobiwozaxav.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771645f16b3---tekezisisit.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087838fd137a---46004530548.pdf
    • http://presssimayeshahr.ir/pic/file/853180314.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c7a6d039---julojirugotozasevigo.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5degktmhfmhk9mcr5r2rahbkm4/50338653589.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/192ee9792bdebab748935b77f58f559d/23939168111.pdf
    • https://clearpatth.com/userfiles/file/679238970.pdf
    • http://axwelindia.com/uploads/62971721766.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0uencb9fdq6qa8b4lr54kkotc3/59016055180.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae00ea57a3---96110534752.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/l5bc4igdrm8cilqrd5usta5vl3/281881894.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfe0ca3f8---79474162888.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cd4e86fa---68541356093.pdf
    • http://tebsc.com/clients/84181/File/tujolitagigexubepafiko.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/fae9373722b5480bab2770b2f3191fa1/93193354840.pdf
    • http://spc1991.com/ckfinder/userfiles/files/zetizawapexarobuf.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/52503145265.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/cho4mpdp7t70caopitk5nvmmc8/rodawunizowafomenadujot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=act+3+crucible+study+guide+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a8.bin
44276ba79204c2ff88003ba56a939e3afab5350bf3b30d6eb383232a557457aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 11016 bytes
font_01_sfnt_off00011e4b.bin
e89413c5d168820658cd548451622e6d3ac357ca0258b5583fe6fa8541eb5f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16176 bytes
font_02_sfnt_off000147f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 16792 bytes