Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfd8ad23b53cba5…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 07:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cddc498a714815d0b32d168dd4cd0fa9 SHA-1: 0c6fd932db0fb8590c330cead32d48b995e14815 SHA-256: edfd8ad23b53cba53f45be03a18bf1b5a83b530e82b23e1ea6bf7c41dd1f4056
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to disposable or compromised hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests the primary goal is to redirect users to potentially harmful websites.

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 http://montoaneli.com/ckfinder/files/rafapebilepigivon.pdf In PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jagizajilevidi.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/54216264008.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vixakevefulef.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zemanebogedopovo.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/54862506264.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/56d91ba7788e44e9b05f7755df8a6d56/76472025487.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5712d6b07099e77fd19639a68c4789f6/mojerokifejubisi.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/golite.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/74293747582.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/liwupiserofalesokoloroke.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/nuravopokijexojokot.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/4586007802.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/37457128386.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/68227119116.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20211003_3DE36C2C85ABBB02.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/vudawirusujajadidawawava.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/90449338821.pdfIn PDF document text
    • https://etimes.mn/uploads/files/53781075474.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/68459219361.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4c13ced9b841641e603bc47fd0dd6000/8024039741.pdfIn PDF document text
    • http://skia22.ru/pic/file/rarulix.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/68332174153.pdfIn PDF document text
    • http://allier-genealogie.org/File:/73575191329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=stuff+to+do+in+hoi+anPDF 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_off0000af8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 10180 bytes
SHA-256: 2f12308eccd72b27d6835422c18d3951595cfa579b08444a0dced4e8211c5835
font_01_sfnt_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 15620 bytes
SHA-256: 943c7e399d74dcc32534147b43bedb6627279ec93f367109caae120352dfbd25
font_02_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1