Malicious PDF — malware analysis report

Static analysis result for SHA-256 acefe72accc0e017…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 00:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 258733f6dcc196d9f7a6374d4494f8e6 SHA-1: cfae8a39e64826353f8c8bc1fe873adefd2507d5 SHA-256: acefe72accc0e01769de8d009377031f7d6f6e018f1c36a77a8fe12a69edba22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous links pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially malicious sites.

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/jixofivexuregoporiwovo.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467f96d51bd---24924666610.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/13987192436.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kozame.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/34085555477.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614206c74a15d---21848483201.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/71dd5hem68f68bcutmf499lua2/43013543529.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f9792bb3---27617788054.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/rajuwideperewi.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/18253728388.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97049608178.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/9547269367.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bfcc16008302f1f4dc2ce92a5328c7de/ridipadefiruravapinujem.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/dakemiji.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4a8322c71b8dfe6a57c39a0f17708fed/dimizu.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/8708042711.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/pivigijugiru.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa8d51579---45879648219.pdfIn PDF document text
    • http://foxadv.net/file/noxifagawenotofomadapu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63b6d2bb6bef721cf4d03e2b68380bdc/67217850385.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/lopivofusojefobu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/potefesuzigujapep.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/30444650273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+4d+wallpaper+for+androidPDF 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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 17036 bytes
SHA-256: 64a710acce234d10026f47e737ce40d8745f2f2a6a81dd22e4abb02448a29a48
font_02_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 10364 bytes
SHA-256: 764c6b3be6add1c90d2866b524e87575ce3c3a71112c599ec7db2d7789d0565b