Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19589e502c66d34…

MALICIOUS

PDF

78.6 KB Created: 2021-07-03 07:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e5bfcd3686a3c57fcbdea590fbc3e50 SHA-1: 47ccc4e7671079d3485d66fb8dfcb8ad0c12bc67 SHA-256: e19589e502c66d34526a8204e29955c597788b15f1b70c7bf331dba71c588ead
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or spamming campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://vestol.bg/files/file/98298351765.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2c44e866---19812244562.pdf
    • https://akproauto.com/nbloom/fckuploads/file/susuxolowozarotu.pdf
    • http://vivatbacchus.hu/files/file/78765874602.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccd0c8b6f---dexamine.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ccf97b05---61147562848.pdf
    • https://ibeguiristain.com/userfiles/files/51796351140.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/siralukanebe.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9775ae9f7---mivupatagekoz.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2f4665b7---favadidiluragogeregazeza.pdf
    • http://giasuthienphuc.com/Images_upload/files/91615399425.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/df6f6dc85653302bbe44f220048493a3/41734369247.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4941dfb---kadoxurupaso.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/50658499244.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a6c99231---vulurozixajus.pdf
    • http://senseoftourism.dk/userfiles/file/14885841572.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609128fcb8096---36992046296.pdf
    • http://a-swiss.com/upload/userfiles/file/bazebew.pdf
    • http://ngocvietbungalow.com/upload/files/zopav.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/boduvusobopoluzasike.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d0e61ae7a590e99128a0d8e8b0789052/78530376672.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a80b623c---85438406413.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/15785104215.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/92035bb6d38859335d465dfe8961bbe9/40528518289.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7161b91e8bb9c1796d9a8bcb928bab4b/gewofovitalisovepixu.pdf
    • http://el-system.jp/uploads/2012/files/87361788547.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fish+fam+intro+song
    • 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_off0000d1ec.bin
6b192ba4aea351cad8656b1285437d254dfded1c99bd4cef8ae300bb5bbaee7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 16880 bytes
font_01_sfnt_off0000fd84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
font_02_sfnt_off0001159b.bin
a950d9aa7b4131f6f81e40072240c9464673c47f11d2ca0c7c3e8798d401d575
pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 10460 bytes