Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b7b644f4f80909…

MALICIOUS

PDF

85.6 KB Created: 2021-07-21 06:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a54b107001917ff372e946e5d398926e SHA-1: 2fafb582148c87a9ce2539d88b9ca9e866fad7c3 SHA-256: e0b7b644f4f80909c1bb71b15167317fc174feca582578ef8bcdc97ac656b697
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely to host or redirect to malicious payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/dc8b782230fd79bbfa0fc2a8b8dc0b19/vekob.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfd52b6467---puretujifonanepofore.pdf
    • http://samsung-service-center.ru/uploads/files/bosizunijanisemuvem.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/d952095b25dd182ec2c4a8ce981ce3bf/jusolafir.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/edf99ffea308558adc05b2d7a2613103/foruvetidixumer.pdf
    • http://metall-press.ru/files/kifefufudur.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/38e677be4c524cc6249074f81075e552/motewulazoxepikep.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bo1555568ioun8f2lv6v3r0fn5/kukekinisomugomedub.pdf
    • http://aryajob.com/user_upload/file/52339637709.pdf
    • https://salvatoredivilio.it/userfiles/file/23693991215.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/92103902372.pdf
    • https://giant-nano.com/app/webroot/userfiles/files/zetozopipijogixela.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/80826487744.pdf
    • https://autoteam.in/ckfinder/userfiles/files/93695103.pdf
    • http://brenna-ski.pl/userfiles/file/faxesegofubewezugozet.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/23099249d908e3dec723065b9f0337b8/pujobafeleziloti.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c389eabfac7---62691760504.pdf
    • https://betenagro.com/sites/default/files/file/5708679336.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97d477c39---5790949813.pdf
    • http://ahchala.com/img/file/17626931876.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/o051fps05km8peg92mp9q6nj52/11789942365.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+insert+a+text+box+in+a+pdf
    • 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_off0000eb7b.bin
11b498dbafd69a20bbcff343270535afedd9c6bea49b59829da19f0c890871af
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17160 bytes
font_01_sfnt_off00011845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes
font_02_sfnt_off0001305c.bin
d68e1a5d312344c7ec46c0215613baf9a989a4fb0fea4fbd22d6839be91b6c25
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 10764 bytes