Malicious PDF — malware analysis report

Static analysis result for SHA-256 937f63185525f074…

MALICIOUS

PDF

113.4 KB Created: 2021-06-27 23:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53dce6b546624e9e81d390d634e915c0 SHA-1: e78e6ad847eb4abd2a2652dc2fe1e7d4e4662d45 SHA-256: 937f63185525f07475ac0dc6355d063fcb089efc2e567e3e0d9d46d382175b8b
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3a110346076d0d58d2fce5697490a1a9/29601922043.pdf
    • https://augsburger-dartliga.de/uploads/file/5294238880.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940d0a3b60---riwolikaxetatixa.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f0c2dc9d---45890919327.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/49b0725fac0c9691b0e5f03a67d05b5e/goxesuxijira.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/db47bbb2fabad936f058faecf309cd14/15308866680.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1161d18a51---3409523770.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60ad6f287---botog.pdf
    • https://ikansambel.com/contents//files/guvoju.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9bec9440e---56934734047.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h59n4e5ick5thr2aqft5hq9bv6/gajufaluku.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ed1337c91835245a78e99390af19d416/7942564534.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b19etdtqpuge5s9pfvvj0a51m3/43870847474.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4f67c1d0eca5dbbb2a4433468c18b68c/67548782271.pdf
    • http://magogaralbamoble.com/galeria/files/zunekepinomirered.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/81t0elpig8cnv15nc5itnl53ea/bejarofiwagafanik.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c448572a6---xetuvelatasuloxini.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/92d0bb739317b129af391779260e7e84/zuravixan.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29eb82e8a---41055872473.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/avlc1gs86k018s8j1inroqupg3/84065092463.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/m2rmt1ekmos0fagn7miv8b1c2a/virefimitam.pdf
    • https://laatjehuisweerstralen.nl/upload/file/sosodekanepukevonekuzutak.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c7cb414730ebbce0e64fdaf0e76e54fa/67620306287.pdf
    • http://www.aluvascientific.com/UserFiles/file/85238121314.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+hand+drawing+for+kids
    • 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_off0001595c.bin
ef1eceb9989a25904f22434638622d62a3015ebbe6f96a881d2a243372391073
pdf-font-stream PDF embedded font (sfnt) at offset 0x1595C 10644 bytes
font_01_sfnt_off00017172.bin
8cf37312e8ef79e062e7aebf6bf3df05489751fd2dcc28bf3a4cc07f731ffa60
pdf-font-stream PDF embedded font (sfnt) at offset 0x17172 18164 bytes
font_02_sfnt_off0001a044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A044 16792 bytes