Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5b0630357725ba…

MALICIOUS

PDF

91.8 KB Created: 2021-07-22 01:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1bd8c860cc877029834d616895b9132 SHA-1: a5556bfe097b7a7c61c8642b23dc5ba9a8eec669 SHA-256: fd5b0630357725bad778243315c8e11a24699e3c8585978741d5c1821c03bbf5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dok-vo.ru/userfiles/file/binikelajivudujixupurawo.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a1877bec4f---sirubujilulewapesetiwiri.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4693996eb---82633454598.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/kegidiretujafame.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ub6cekajevo34m3pnfs50679tb/76757210135.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/08c13f1f3cd38f4e33afb518af89fe11/39081924767.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f14b7509a---92454433265.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7dd728c3b927507ee41c616a8654ff38/kosajiwizelimewadoj.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/sutudimuxidanemab.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510075019.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28ed2f375---jakubaki.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/jegavepiwosaridusa.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/29356931700.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8ba9303f96968f379a7d92f9533659d2/39965535638.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607695a90a110---71343149691.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/vugegisuloxusijib.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089192f8e62f---mirirasitu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/gibijubofagam.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fbot9jfrm7pa0ksqjvif1b1lf0/paribaravomikoxarasuk.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f7059109b94521e8d3c02058c5643dc9/96402955271.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/wewukijogidu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/65f7uhenftpqr3m03v5kkdl6i6/senujawenirenerubinigoz.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/20204498820.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejavufavotusi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ac0dcdc5d5a17d5664f0e80fad8da4d2/xujutegaxumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=atomic+structure+practice+problemsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10652 bytes
SHA-256: 8c11793256d7fadcea46a94ae9285dc1d9bff950bef3a485e83ef7853ff5e6c8
font_01_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 18068 bytes
SHA-256: e1333020d1f3df13fb5b401f71007cc9c8e12b394a97562e2f0981011cc2d5db