Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee6dc2a2e47f205…

MALICIOUS

PDF

78.4 KB Created: 2021-08-01 02:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 610e4a4e17484aa04b6d08021ded45ba SHA-1: 9267232490eb3a20c5ab65ebc62e5f67e904ea21 SHA-256: 6ee6dc2a2e47f2056883042141878b3040deda37bc4db94231a87bc8305587c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/667b1e289626b8f943e199d487ee57d3/24165433367.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849be1389b1---89509147646.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35bb47bf2---pasasoj.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/53206922260.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/66490399393.pdfIn PDF document text
    • http://distributoram.com/files/file/dajufumulirijaxoka.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/87381291805.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/81e1698078a65bd31987185b7f7175ec/ruponufe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbc3af7c7---38449232390.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/12816969899.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607979828b89c---jigivanexu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/mhrueijp2b6q36a1qj9dtkq5nl/2460884141.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/34466718223.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16242141653532.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/56841008280.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34473127372.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/simidoseduvadugalatewana.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/61021866150.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7eec9fdd---tegulijixoluveziwikif.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/63398069471.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/13720752698.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8b49c8ce---11824644958.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///8399563735.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9429f24071---xetazupelepugen.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nanuresevuwemejebiru.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/41041061664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chemical+equilibrium+grade+12+questions+and+answers+pdfPDF 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 15512 bytes
SHA-256: 4a9b3f53ed0e08b27ff118ea27a99c1c6ac8b3a272c18ad65a35e024cbc27e09
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 11740 bytes
SHA-256: 2a334b17b941dfb318fe765f68f9f681a220b717bf69c1aa259e567be510da21
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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