Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1219ffe7ca7f3d0…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 959c41a8fabdbcd0b4d3d63d14a21b41 SHA-1: b4d265495aba9e3e65c27bb1a332f13a5ad69706 SHA-256: f1219ffe7ca7f3d0ea424bad14b6b79dba306f91b81a6010d9461359eb75f0c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://meghdoothsuzuki.com/uploads/40971864180.pdf
    • http://gamebonda.com/ckupload/files/kagepufubozud.pdf
    • http://stfurnimart.com/file_media/file_image/file/88394865872.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/1943428258.pdf
    • https://kalimati.in/userfiles/file/33665637613.pdf
    • http://abwninemile.com/uploads/files/napodefizobolo.pdf
    • http://michael-dhom.com/webseiten/file/juxotojunovidugofepufe.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8044cdbb---52625860928.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ff0f8b079aee5886237aeeda5ab8ac1e/vakoduwekuro.pdf
    • http://jrmhandling.nl/upload/file/jetej.pdf
    • http://kim-clark.ru/files/file/25426910956.pdf
    • https://alteanetworks.fr/img/file/soweganiremenoxasakawe.pdf
    • https://marbletreasures.com/uploads/image/files/felazizi.pdf
    • http://mlsy.cz/images/file/files/rinoseruxak.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/15949148463.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81ddb8e06---53816295162.pdf
    • https://tramhuonghanoi.vn/upload/files/kowuxoxadefafaluvixeruk.pdf
    • https://carcable-bg.com/uploads/pictures/files/20321590123.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/91668595911.pdf
    • http://daejonggyoyc.com/userfiles/file/20210901170131.pdf
    • http://mtreurope.com/ckfinder/userfiles/files/fizexikogelorela.pdf
    • http://akinmedikal.com/uploads/file/fonanedexojoz.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffc1700f8---19409898942.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/pufopajuraruz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=prepositions+paragraph+exercises+with+answers+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_off0000e991.bin
e7a6725cf0861bba5425acd856bf00b530cf01d4771b345fc2ab144bfaec8136
pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 11040 bytes
font_01_sfnt_off0001031c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
font_02_sfnt_off00011b2e.bin
50032d0a643edf41b820f123903fff5f1de8d998208c68602f98083947254c88
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 19020 bytes