Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f27e3fbb1edb21…

MALICIOUS

PDF

94.2 KB Created: 2021-07-13 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c209523cb13e7c6db6295b1773a172a SHA-1: d362a9f3571fab9bf39c336adb21ae4e9b431164 SHA-256: 97f27e3fbb1edb21d40706621a17576767906fba0a02e63f829245a3d96e8bfd
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further support a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://ttccid.com/userfiles/files/zaxomibarosavavor.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/66365745432.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/86639f405a8199905f8eb4ad04299bb8/xetinozopuganep.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b711eaa6---nixesiwavinen.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1556a47f0---fuzuroniziratonox.pdf
    • http://guides2alpes.org/uploads/file/47758720540.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/873991e0fe89efcbd4250ddb0c248d78/savaxipukaneraregimafa.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8486ff7841ff31f9d566caae0b7adbc6/tewin.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b5be27fc4bfaa7f5a7c32b05932e1529/zazanuduxizov.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kolazatepokik.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v6im5b6d83m5pmmmo69re1fsk4/11848157027.pdf
    • https://humicdp.com/uploads/2021-06-17/images/files/mujafuxoxevojipazajoxotat.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba5b7c0bc---25595880042.pdf
    • http://dlevitin.ru/fck_editor_files/files/wifojurawunisesura.pdf
    • http://classicalgardenornaments.com/uplds/file/vetatilatuvuna.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202107131225471186.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f086638252f2977b87b4e57570027232/sideraxuwivuriwusudur.pdf
    • http://allasclub.com/campannas/file/vamipulesazavomoze.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a83f715799---zokererewisixez.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2bdprbcb2rac8b88rd5t3ighb0/71804334927.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c0037a28---59955929564.pdf
    • http://ottotech.center/userfiles/file/lokoxumajizogopo.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4d377edc---41807663088.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+prince+of+persia+shadow+and+flame
    • 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_off00010940.bin
04bd832df4b39f315895334fc6a55bc415d4397949501f2d03ef393cda129b0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 10876 bytes
font_01_sfnt_off00012231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16792 bytes
font_02_sfnt_off00013a43.bin
10d5a47d57e06a5c06b7965408ecab8344c1ccf461be1542004523b1998497ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 18416 bytes