Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c132955f78a5ebd…

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 19:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcfe2dba02da0f1ae121248dd08a8bfe SHA-1: 9dbd4b76f351fe3b36329e079927b9107bfe5ff6 SHA-256: 2c132955f78a5ebd1e01af9d929669552ba907c47c81d575ef4f176dcc0104a1
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of external URI heuristics and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

Heuristics 5

  • 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
  • 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://sonsuadogo.org/Images_upload/files/50958437998.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/34771631925.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/19518831731.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6a8b335cac9d610830315b457de5667c/gekaramav.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/siretuloguvipizex.pdfIn PDF document text
    • http://telektrans.hu/editor_up/46598559093.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/figajuz.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/luwefep.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb58776327---52815115093.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/42916228670.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/63457653310.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/sidumujememojinuda.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/tekalewajupugurovul.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134765756980---94494527263.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/14255522102.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/32021226690.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/72266367298.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/10877531509.pdfIn PDF document text
    • http://dongphat.net/upload/files/jofofusu.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/68776628601.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/7614356074.pdfIn PDF document text
    • https://signika.pl/Upload/file/benabeputalurilidatopujon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+talking+tom+2+cheat+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10872 bytes
SHA-256: b7c3c52bbbe4b5e7d8f109b983c72e20e3df0f13da30ac0825c4551e726b4ebc
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 1872 bytes
SHA-256: a01217a9f1f7e6f5e8408d73f07734bac913c33ce378ee653c7b6b059500437b

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