Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87a068dd4468778…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 22:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aaae3bc10c85bb8d796fc7496649bfd SHA-1: f7ca1052a77a9d320cfe34b108b276fe6db1b711 SHA-256: a87a068dd44687788d6c2a619faa88fa05e5e6da6f07ef53014d57f51107fdfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=latest+update+for+redmi+note+7+pro
    • https://synodradomski.pl/userfiles/file/nufam.pdf
    • http://homeopathyhongkong.cn/files/dinujuvobatopoligupas.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/48721075573.pdf
    • https://micro-logic.ro/images/uploaded/file/80740261968.pdf
    • http://huynhgiabaohotel.com/uploads/FCK/file/57211514303.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/27191192129.pdf
    • http://sushistoryus.com/uploads/files/gadevifeguluzefexefun.pdf
    • https://dpengineerindia.com/admin/userfiles/file/70191256818.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/jukilujurosewarurebolok.pdf
    • http://beiwendq.com/userfiles/file/9559200886.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/duxuketubiwejugifa.pdf
    • http://nktrading.qa/file/files/razofezigelebavopikobe.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161518fca1be5e---96840707318.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/59300018891.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/geriwitili.pdf
    • http://nyitotthaz.hu/userfiles/files/74675050328.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/646c3517821c2d2b89ac906ded261485/fowagewudupufi.pdf
    • http://artecgroupservices.com/imagenes/file/nipowinisadetizami.pdf
    • http://cosmoscm.com/contents/files/buxuwu.pdf
    • http://aimecostruzioni.it/userfiles/files/39249573472.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/29995674574.pdf
    • http://www.fashiongale.ro/userfiles/files/91726618056.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259a45d21f---zulixalepavagaji.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/7757202160.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fdf1fe09---babetizakofadugu.pdf
    • 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_off0000b347.bin
0e32c7921212f696269a2d0ea37898ff7dc5fa180fcbc93581cf3af1c617ee9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 17832 bytes
font_01_sfnt_off0000e117.bin
8407cd60cc2ff54bd06360aa4b0c6806b0685b6056d32265e6782a7cba08ad53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 10720 bytes
font_02_sfnt_off0000f9bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 16792 bytes