Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f60baba1f09473…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a9d61a4152fc2f833eee7fb63f6f734 SHA-1: 347ee10d20201bdfa267b4e2d6d7cddddbf004ba SHA-256: 84f60baba1f09473f28d36b528f35996d079944148f93c932fa3075f672fd11b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mitroc.com/userfiles/file/73361475857.pdf In PDF document text
    • http://krcatikyonetimi.com/userfiles/file/36689489274.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/59411452401.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/1748598354.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/21408834194.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/tezuvitaw.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/digazanamogotitelokunete.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/pajupiwepaj.pdfIn PDF document text
    • http://baoveantam.org/upload/files/vujiseveferefekax.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/39018248211.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/fivukudisakokizera.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3f144a84---jenexanadikezokavobu.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/72141531816.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/27590542986.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613de855f04a4---xurejusipavopejumog.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/jupirodutunaleg.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • http://lscapital.it/images/file/sonixoninisutozinuzurav.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/ximivig.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/84500930193.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/84103885133.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/50068205892.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35092893617.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb2fc252b0---55123772335.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kasano.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/wijowa.pdfIn PDF document text
    • http://vuason.vn/upload/files/31665963116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=app+to+transfer+info+from+android+to+androidPDF 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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 10592 bytes
SHA-256: 039b01035cc7e9c8a3da4b21647c9a6b49a3bed95d6be776716cd92c26f22866
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 17416 bytes
SHA-256: 573c1c1d0918131098687452a3c630043693449ef5b295d4bf868a5836e8160e
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1