Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e58c49f1ba92b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 21:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75010c57389d372dae37203b4d75e833 SHA-1: bd2a77c9a98e5532a0111cdf61f3de52fab8ca37 SHA-256: 774e58c49f1ba92b80acfa2a649d274d1c5ad6d0810eb767a12d036159448e19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URIs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0ff44453---jesediruranisulozat.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46cff1ffda---12291933187.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad961f50d45---kusuburetakos.pdf
    • http://msslink.ru/userfiles/files/kebaseralirizetexoduwo.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/25566428058.pdf
    • http://abwmechanicsville.com/uploads/files/70471159884.pdf
    • http://gibisch.org/files/files/dudulovijuzufekarab.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e39152a07---5143627261.pdf
    • https://techson-cctv.com/upload/file/xuwirubajebar.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6f83c333753cfab0c6fd79eaf4493491/49664862003.pdf
    • https://tidaksusah.com/contents//files/napunuxamudoramizupux.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/874263134610841993f1f7.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b138bc4c594---bizaveweme.pdf
    • http://chieucoingason.vn/files/torodetulale.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5272f50d18---wafokoz.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e8qoaak9tkhnoj0hj8ahgnd3sb/vakonilozigopalutuvuwerib.pdf
    • http://guitarenko.fr/img/files/dozudebibazezudu.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m42imtq27kbmitnbp7avo5sm7l/kugifemo.pdf
    • https://ooo-kenk.ru/userfiles/file/vazepalalokilezem.pdf
    • http://ceresasrl.it/userfiles/files/87890235764.pdf
    • http://animalscipublisher.com/files/upfiles/file/10818855948.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asperger+book+pdf
    • 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_off0000d30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 16792 bytes
font_01_sfnt_off0000eb1d.bin
b76629c7c1d8c0ecb79eaf90461ffd424d8e1f6850c279aae1d5b9056724f5ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 17664 bytes
font_02_sfnt_off00011833.bin
65eaa9236e228b9429b4a94fa5a61182a67630fab3f72d1ebec8ed0b2447ae82
pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 10384 bytes