Malicious PDF — malware analysis report

Static analysis result for SHA-256 9722d6a61f16f039…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 22:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8982ceb4117612790ce208a3f77c4a5c SHA-1: 091bdde1c42d0d754555a357598d187494710235 SHA-256: 9722d6a61f16f03964d240ce15f0d4ddaadd43b48da1eeca97b7a4255cdda6f7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://e-kva.ru/admin/ckfinder/userfiles/files/nulopa.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c8acf80d01fbaf551e86fe1908e06b25/23959908750.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/navivelezubofasu.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/valup.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/lirobozabufogesekofigogu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/68424724927.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/27402688440.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/51800936623.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/338eddfd4131eee3e1a62b7c38e3ac5f/74341374926.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/jorusimezodizutegukagul.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/diwebil.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/66647671572.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133728eed248---xerokadibanoga.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/16111519807.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/kusupibexaxazovejili.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/91364847205.pdfIn PDF document text
    • http://jaatkinson.com/userimages/defenivofitopesegor.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/natijokifibojejegejujila.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/kijanalenisutuwazale.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/jasomev.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/rotazivetana.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/nilugiwituwine.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/tufosogewugiwafaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=se+cierran+las+aplicaciones+en+androidPDF 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_off0000cc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17488 bytes
SHA-256: aa22bfda1b8f75d9cc189f96ca4f789f946df82a43b2cd4fee3bf61fb45b6de5

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