Malicious PDF — malware analysis report

Static analysis result for SHA-256 001f73096223f1c3…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 20:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a15bc2daf10355a82e9365d3d26bd76 SHA-1: 9ad26e66eb64c21d6016f76241342082505854e8 SHA-256: 001f73096223f1c332342bff36ad169ed261902006845da489e5933f50e5b405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking human-readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://amursvoidom.ru/media/files/risubapagi.pdf In PDF document text
    • https://alkathirilaw.com/userfiles/files/jizib.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/24437f3bf70cba153dc59097cb9e201c/kerarivobaxepep.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/pobavutobovumu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b949094ad---27635045359.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/28374078928.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/64946361398.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88829187963.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/40eafb950114db0804a85c51774fbc3a/vuvotife.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffebd6a56f---faxiterutanedak.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/19776285135.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100dec6e60eb---59507626844.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96241df188---bavozeku.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0dc1298265e368977aaf15b5e5fa6436/71347415626.pdfIn PDF document text
    • https://ewt.cz/res/file/guwuneruxexepoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/luzeboxoxarotigivimeguw.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/mosetuxuk.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vhhqu7a4in2524goutc4dvmppp/xiluzimewibezotesot.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/06095d2a52f4195e3903b25af20f022f/73250530174.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6da45a11c4f78e28c141ea7a1c964315/42192174132.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/wobukumas.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/70725269491.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/83ed70cde9f255771010f60517edea19/35778465332.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/699918446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=basic+electronics+interview+questions+pdfPDF 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_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 18544 bytes
SHA-256: eff9a120ed05c2842e5d3fe5a27df7bda72f2ec05cd7385f19d4c5bfb8dd79c5
font_01_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 11064 bytes
SHA-256: e86bc5d5853dc90161a2bd2fad812db982eb55267f6806682f87b719b1534c0b