Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98837bbafaecf85…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 05:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb3df30b20b815e594bf1e0813f8d837 SHA-1: 344a7e2de1b1a98654186c344de25f847254c9ce SHA-256: b98837bbafaecf854dd511eb162f258ac05b7a08ff1756046c46ad7e8709108a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a malicious intent to distribute links, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/razowuzesud.pdf In PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/muxob.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/sitizakix.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ca6b95b6---tolubezekagiralel.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/17646079933.pdfIn PDF document text
    • http://henca.com/files/details/file/lugabil.pdfIn PDF document text
    • http://consade.com/userfiles/file/93573230301.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52492a2583---75925074162.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275f713ee6---majupoxazipiforo.pdfIn PDF document text
    • http://3asoft.vn/img/files/fobuvodexigabiwetevesavad.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/546f6bb14521281f51b6f79909e1bc66/fefoxufovotilavisejo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/gefidefatuluneker.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ea1dd3a4f2922ebe1140d9f7646771e/96818508281.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109052206399240.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/39528069714.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d07ce0b1f1---37407453133.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611be19a6d0da---94653849988.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bea96d2545f---27906248524.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78687aab5301c9fcc44878238c84074c/16089980006.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/55c58744e7086800b6b07f02d85d126d/39124348901.pdfIn PDF document text
    • http://premium-h.info/files/files/77652137737.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ukrc3vgsm9cj0ta3j826bet0pl/sowumusitokokefakoma.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/pebile.pdfIn PDF document text
    • https://rajakedua.com/contents//files/latonoluxodezomudoxevatoz.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/72309474172.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/42309153124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=quran+pdf+urdu+scriptPDF 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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10476 bytes
SHA-256: 36754873206ef7c0b0269801259c9713a0347d563b5e36c52bfe2fa2c707a25d
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 17844 bytes
SHA-256: ab586d45f2c4a5b50e8a695a7a76db26e07f4c593783ef212c9ccc6131449ef6