Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a4d4d2ea418610…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574d484e186707de82128819e4bd1d9c SHA-1: 3622ffdda6099102781094f4d115f0f16c26a18d SHA-256: 93a4d4d2ea4186109bc338a9547cb8679a499fcddbeb9068de4241d9dc5c6064
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, including those hosted on WordPress upload storage and other disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://indecomavo.pl/inc/vibeparilenabuje.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/laq4dni9ufr8li5i0bhsdj0j71/kotulofuvi.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0250enpbo0c3t12bh426l4gm30/80300724376.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ca571404734c94027b2a5ce19560b857/dopezoda.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/br2n5a7hehi01ob47puovljp71/bulazarepekabazasosokodi.pdf
    • http://chickenwild.com/upload/contents/images/images/webuwita.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7d293f48---gupupopudurixodemako.pdf
    • http://www.allatpatikapecs.hu/images/file/zorotelinux.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d33e0bd---76052224361.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f5b97429---81015687866.pdf
    • http://absolutelyneon.com/userfiles/file/vunetupetowebikovizade.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098da25f1d53---vimosaxi.pdf
    • https://isleo.com/i_photos/file/50229762440.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5bc54d4206b39a4ebe09c880cf3f785c/5774449299.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb47d5c65---ziwawevijekowomexitopasi.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429120002233008.pdf
    • http://pc-driver.ru/userfiles/files/19682828378.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/wujafituribetenokasoxun.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/gajomeminovazerasoz.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcbe0d1e3---58752034956.pdf
    • http://wtmongolia.com/materials/file/71293463469.pdf
    • http://microcement.ua/userfiles/file/22337739637.pdf
    • http://beiwendq.com//data/attachment/file/68741152310.pdf
    • https://avayemehr-carpet.ir/data/file/mojagilojibosuso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=iso+and+amt
    • 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_off0000f823.bin
a60cab75467fa1c7fe8c624641ac6fb77b9ea20ed78146628875914ac10c544d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 17328 bytes
font_01_sfnt_off0001256c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
font_02_sfnt_off00013d82.bin
d11771906e171f31619b0f28ae53197c300e38dca3a8cf68ae084b4739d5454f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 9992 bytes