Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cf10dfb3c5cfed…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 14:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da6f635cec552bf0d5c01305913cbe47 SHA-1: 43fdfa30959ac0456f3258e43a4377b2c26d131f SHA-256: 33cf10dfb3c5cfed6d80ed3fc42bdd8a75111f6979b367b48fc5d3ad32975255
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://edumedcare.pl/upload/files/96071716136.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92e679b0e---kazuwezojaxapa.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/93202451832.pdf
    • http://hilltop1976.com/clients/24685/File/biliwijodezebin.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d775mdlf2h9cjigcda6hr4cfr2/8745135508.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4e0a7775e305a5c0258d8d6885b568e1/95957022794.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/telajapuworatozo.pdf
    • https://netiko.ge/img/Data/file/wikewuwusaberimosopo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/dabf3fd20b331a35a5e8818f80f21e2c/perozaramatalasip.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a569498f869---lagedamasobakenuparetizo.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aaqs4lguq4e7llvr6lvi6mkl26/pumiw.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/lisikukobonaraweva.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/83971f13b11af2fecb2a743d5c0fd389/70660358463.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4i2ciap5n3kvtd05one57i70ci/608708342.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a436e309---muzutegumugekamoliran.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mrh4c97t9n4d9rttkulk3pklp5/nebevubejewegaka.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/tg59j9k3sm50o0psskbgfhq4lt/koram.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d0cd38fb9be100f35f483276e73adc28/nexume.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba791503c---lamolefuvupe.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e93b383---48829178187.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/aa66c14c664e8316e39bd3d54c3bf579/31871138388.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/remabosetulul.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b8db003d56fb9db20f2a5d247d35bce3/42868669292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=defrost+in+water
    • 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_off0000f9f9.bin
5b42457dd682d047c9e69809f828d7001b33c3163faae51ea59e29bd2873a2f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 17744 bytes
font_01_sfnt_off0001280e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
font_02_sfnt_off00014025.bin
65bb439633958e9a42fba62628199a6a45d249c0798d5ecf29a12f51cf852ef8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 10248 bytes