Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac7b9fa4a3c3bb2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 22:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f7aa2639bb2c5aae403b5bf59991dbc SHA-1: 8c9f90d4a8c31e704f31bd02ab0054ea019884e3 SHA-256: eac7b9fa4a3c3bb2896000dc8971ab89a750afa7ed093579466d6688063422a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a tactic to obscure the final destination by using disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bb038d32---3956008971.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/84403286433.pdf
    • https://manuscripthandler.com/userfiles/file/88520184805.pdf
    • http://littlepearlspublishing.in/data/eimages/file/bokonetekibolu.pdf
    • http://iqlacpro.vn/emotive/upload/files/47374681157.pdf
    • http://cameranichietsu.com/luutru/files/ladewikasufoxuzefebigi.pdf
    • http://siripanyalamphun.com/user_img/files/xatenezinewuzilofakiwi.pdf
    • http://kleinschadenexpert.com/userfiles/file/94045039504.pdf
    • https://sakkestadbil.no/userfiles/file/zawepurok.pdf
    • https://at1-turbo-j3t.com/contents/files/mafuwede.pdf
    • http://ageofwonders.buka.ru/sadm_files/99975953817.pdf
    • http://alkathirilaw.com/userfiles/files/74623899297.pdf
    • http://dinobajka.pl/Upload/file/9942054430.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038b248a17---84980062694.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/bekedejimufi.pdf
    • http://bonezi.morefriendship.com/upload/files/16691163716.pdf
    • http://kamienneogrody.com/userfiles/file/16262655413.pdf
    • https://chataigne-cevennes.fr/imgs/files/79441088625.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161302fdaa71f9---30071417029.pdf
    • http://banlinhkienlaptop.com/userfiles/file/31338811471.pdf
    • http://3sdent.com/upload/files/21143728471.pdf
    • https://hsse.cl/files/76825293190.pdf
    • https://eyetracking.pl/userfiles/file/wesodidepawipu.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/8710038110.pdf
    • http://derp74.fooden.com/UserFiles/files/nesanowokodonodirilalebi.pdf
    • https://kultmotor.hu/images/files/63210790526.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=extreme+car+driving+simulator+gameplay
    • 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_off0000c551.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 16792 bytes
font_01_sfnt_off0000dd68.bin
918619c0f2199ae07e10117eb67d0e3b835f48baf73cf217a5d46004fa055a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 11220 bytes
font_02_sfnt_off0000f786.bin
d97314b621e01ce8eda9b0a72d4e68fd48c855b1a26a4cae212c9f6cc5203c8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 20216 bytes