Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa0ab7717b4437…

MALICIOUS

PDF

75.2 KB Created: 2021-08-17 23:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c31de42c40dceaf4ab57a802d80f3c85 SHA-1: 3f6c47e039c7b398b7b8b22b247cc9717cc61d57 SHA-256: 24aa0ab7717b443712d87391303e2d724345f76382de812b34a0f616a245b79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised sites suggests an attempt to obscure the ultimate destination and evade detection.

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 http://baiduvpn.com/upload/files/4304856554.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6d3847fe---64064835481.pdfIn PDF document text
    • http://flirdining.com/uploads/files/winadujisawixilubinem.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ijcogfn65octjkhplmdadhlun6/37864318577.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4af95a723---22900843084.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/k0981um7g81n570mt5q80m5ri2/78053777481.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb3e7eb68---xexewoje.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/65928924342.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/vavup.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jmmqth2876u46qo59d68mjm096/52954729303.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/673b22ab6c3b6e7a63a066a47fb68513/pixexigeso.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb942acba33---55979566358.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/bedimo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd200caef---webuwoxu.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/56456022309.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/xavosinupineduvoz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfc6e88c86---ganuku.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/45191249993.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jemewisuwatofor.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mapotateverexozupoger.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/667587a22571de3850e10618dc93d963/tegelevise.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/numofimomolijajo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0705be1416---67979245133.pdfIn PDF document text
    • http://webursitet.org/Files/file/48179513115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bhagavad+gita+audio+mp3+free+download+teluguPDF 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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 16664 bytes
SHA-256: 39bb41dcab2ba05d3d8288ef3112dcb5f45b34745de8149229d06fee336a5fad
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 11252 bytes
SHA-256: 37675218c32c770cce0d373d9534001d0456fb3c5da8a8e4356394c846960608
font_02_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1