Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcf2379bc947e48…

MALICIOUS

PDF

91.5 KB Created: 2021-08-09 13:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac766f21558b7433874cc9efe778d9e SHA-1: 8ace603c0e33a374fd6a238af7a6ef887dd32b5b SHA-256: ddcf2379bc947e484b14be19ad4513a410c7c67b9cc04f5bd4270ba8634871a0
184 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The presence of a "download button" lure and impersonation of cloud document services further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kingnature.ru/files/files/38529138025.pdf
    • http://tetobox-budapest.hu/uploads/files/74013142509.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/lumetazesezo.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/zebibipakoxetipib.pdf
    • http://gramercy-grand.ru/files/file/pesikikonolidakute.pdf
    • http://szkolka-wiercioch.pl/files/file/sipuvirimowi.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933b21c173---53282474133.pdf
    • http://www.aqsclimited.com/EditorImages/file/tinurulimirowamup.pdf
    • http://charnafamily.com/clients/60216/File/vujomasuxijevum.pdf
    • http://www.netcorp.hu/data/editorfile/85256124035.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2104626da---jeviz.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b9666d1b3---61832728787.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf26768ea---tozagajifewazudidomezen.pdf
    • http://temple.mo/userfiles/file/90701909902.pdf
    • http://dalaichau.com/files/kewuwalonenomo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c21c230f3---21405972861.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/zefadejivejaxejovibewedi.pdf
    • http://plnjl.com/userfiles/files/lakogiboduxikisepedaxo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7d03896ee363d63e41d1a52d88a97b91/suxenubaviwubejusenugomi.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cd86619188c5da66c7588e37f4eb4f10/rulagojulipinipaxuk.pdf
    • http://htwy.com/upload/file/lidadunifubitipawugirapos.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vifazijabaf.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/tukamizin.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9fd275c7---mariwalupamopozog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=crack+para+office+2013+32+bits+gratis
    • 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_off0000faf8.bin
efa709c44a62ee0b98c6428c5cc31d01464f924ed5b15c8c25b665e8f6c1059b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 18736 bytes
font_01_sfnt_off00012b4b.bin
a3435e7a943d71e3effce4d96f465c2ef095b55ba38c45d24ae06c601613df9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 11236 bytes
font_02_sfnt_off000145b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B3 16792 bytes

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