Malicious PDF — malware analysis report

Static analysis result for SHA-256 672602f8fffafa96…

MALICIOUS

PDF

86.2 KB Created: 2021-09-22 11:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fef4d456b6726d9073d2e3ebc3447e4b SHA-1: 4725330b7d1cac6b95f72b165eeac50c552f150c SHA-256: 672602f8fffafa96c7508383469ebfa3f3c8801ccf2183db6094711ed9ff7d2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with URLs containing 'utm_term' parameters suggesting phishing or SEO manipulation. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=online+casino+app+android PDF link annotation
    • http://sung1.com/upload/files/78644998240.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vowinurajaw.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/37919955107.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/79666320968.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f28821d5---10860899428.pdfIn PDF document text
    • https://birotex.rs/images/files/62172194764.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/16206511376.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • https://ienter.bg/files/torutiw.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91131968389.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vituralasikabagu.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/ziletegefo.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/vexixefurafufukatare.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/24775762147.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f7b52422c82c900fa0f0a6f650ea9d35/pezowogozobosegu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbd73b5d0b---gulapotizoke.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/xozagujevividarik.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0975e395---ganexavelewi.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mejejivurodosapimirez.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd40e08b71---ziwokegodifubutupomofof.pdfIn PDF document text
    • http://bscartridge.com/pic/dotikowavakomanisifuzib.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/bedakupipalepa.pdfIn PDF document text
    • http://guitarenko.fr/img/files/99786351324.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/tujabagul.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/munozikazikipogudupozomel.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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 17300 bytes
SHA-256: d2a7850b9401c7840ed5d1867b0aab73450d23998f96a78a87359e6c5f51fcc4
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10436 bytes
SHA-256: b77d580ce5c541816326700d7faa9743901aa405b2e5dac76ceb2baa2ac336fc