Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c25dd778c3176f2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 21:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0745adb13d4d3c3a8d72e83682a97e93 SHA-1: 2d77815afdd9e452e7f25dc48225a7a38c454920 SHA-256: 2c25dd778c3176f2e760378797087669930b130a5a39354b658e9beb02a8e30d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=traductor+pdf+gratis+ingles+espa%C3%B1ol PDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/dc025e0994e9a1cc0c4ac62b69b23f40/7038089068.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/mavoda.pdfIn PDF document text
    • http://mobilenmr.com/files/files/12709972578.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pufufibadopapix.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/tigopite.pdfIn PDF document text
    • http://vhz.cz/user-files/53425492534.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/madebimo.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tegudoxajazukigal.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84585b73---10238395047.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/dabuzezofub.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/77585500670.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/72207214729.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161110d6712b54---wofituxipukazisejasiwa.pdfIn PDF document text
    • http://progetec.org/userfiles/files/84402848170.pdfIn PDF document text
    • http://fitviewer.info/files/file/30805176394.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/cd9e1224bff5ae1fcf3d6c1872272905/14529851080.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/68784374059.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fv3g6587e9bhev3p33ggj5pnu4/44744878411.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/97992660115.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/gexejurafoz.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/naxipu.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/xoregekikekavusevide.pdfIn PDF document text
    • 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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 20436 bytes
SHA-256: bd183c429133dcb2686ac4f4c479fb920f67510ff6571151ee5a65bf682fbcf3
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 11064 bytes
SHA-256: 4648a6f0f35765f221294dd9c949ba5394d3651125e05ca8ca20bf697626b2b4