Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da4e3e15c9c3d9…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 22:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc11e0ba911a595391ea4f08c07b49f SHA-1: 69217261314aaaeb481b9893dda584a91fff3de3 SHA-256: 75da4e3e15c9c3d9851cbf4cc970be75b26fbae63dad757a2a052f2109761660
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and the presence of multiple suspicious URLs point towards a tactic of overwhelming the user with potentially malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8fb465131b43d29bd5f3f105b51a44f/1242317106.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a610a8b2a12---legagaroxegevosixesakak.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/39ad1d547360c967f409c78161084502/nufefukerinaxari.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071628364491---wozunezovasefewusin.pdf
    • http://aelma.com/sites/default/userfiles/file/47358714580.pdf
    • http://curry-box-deluxe.de/userfiles/file/bujukit.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e56aa3d8e---devokigaguxude.pdf
    • http://biotledlight.com/userfiles/file///78278641292.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4287d970e28ba9bb9a8e2f6cea2ce603/4485750665.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0e93f2e8---milisagofiwegopeniku.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9fbfb541ee60ca6df7b2eaf006ee4368/defumudafalalepiravumuzo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4ec57204---26939457385.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b8987c64---66452002122.pdf
    • http://bhs-class1957.com/clients/35434/File/10355843497.pdf
    • https://fruzsiflame.hu/userfiles/file/16409788043.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/429f6ab31e7b39ab5b73120c8dd49fc5/xevijidiwetatetiwofokep.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/divkf31gvob1b0eeuafjtj7q25/jimevetimujezujevopan.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb1eeec1b---xixuguranadedurilev.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad16e9aadd---49281362048.pdf
    • http://aucoindeshalles.com/menu/file/barolimemo.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/33426811119.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561e66095ea3ccd4ca24e03121a25537/mubavoro.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bfc0dc8412383f022072f254168d7f9e/14092170805.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=juicy+j+mp3+music+download
    • 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_off0000e4cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
font_01_sfnt_off0000fce3.bin
c92930961023c10d5892f7a1c3339cdacb8c95934e421eb1ca03f6b24c846da5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10940 bytes
font_02_sfnt_off00011643.bin
cb76676e44204a2232cd12f930d6c2f2c40d363da28f3755806dfd64569bea1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 17676 bytes