Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8f869f4177dac8…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 16:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bcd2753d3b84984ef9926ae3fe8c6ba SHA-1: d75b1a296b77dce1d96b63543ffecadda10a2cc2 SHA-256: 1e8f869f4177dac8bbf49e47c8741a47c4dc72ee172328008fd5cb864d0b3511
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The PDF structure itself is a link farm, a common tactic for distributing malicious content.

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://gitedu.in/ckfinder/userfiles/files/40535690853.pdf In PDF document text
    • https://synersys.fr/contenu/file/geboregutuwaporafu.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/marixiki.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/33093546891.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5pui6vnn1c0tf5okua4tnt2f72/80147821464.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/pemositedaseleside.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f97f809---75274175086.pdfIn PDF document text
    • http://mopron.ru/upload/files/56918972911.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/148d11adcb62d1634191c4cbaf95d8c9/60366099255.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/wexelulejeduxegagi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/56252593008.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/58669979945.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614113a122453---59953410963.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/gugulejuxuteloxe.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/niromiwinesodekaja.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/61326166022.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/30744401251.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/85455615406.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/tewuxigomilan.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/41489704216.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210909_121402.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/08189fd5784ffee5624474b9a86bb9bb/51791496101.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba29033ce469a0dba8f8b584f43c58f4/56059490669.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/87556895450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+instant+app+examplePDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 17180 bytes
SHA-256: ed2298e5cce13e163add87177ad1b36d5bc0ceef98fc5e94284d09d05abbc1f2
font_01_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 10636 bytes
SHA-256: 867c5ad9bcff41d1ee3b0d06745c7b2de4b0dfca6ebca6926cf587a93e0ee71c
font_02_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1