Malicious PDF — malware analysis report

Static analysis result for SHA-256 683f344d5e015aff…

MALICIOUS

PDF

83.3 KB Created: 2021-10-08 02:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c1f9a21464209f3a0bdf00344ee3bb7 SHA-1: e3df99850faeefd1308c74b5f56f6999f7378af9 SHA-256: 683f344d5e015aff8113c1216a44f10b9674160331068b606cfc333cb9367d1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=world+coins+pdf+free+download PDF link annotation
    • http://jfhcoaching.nl/userfiles/files/mowutijuzapigiregutudexo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/duwopuk.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/5818082189.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/94752306740.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/55990386933.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wegipizaj.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65ff639f2---razubajelulixevimow.pdfIn PDF document text
    • http://gtshotel.it/images/file/tuxexowuge.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/buxuxegogevabamozerorixe.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kumilalazedidinumijamino.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/tibupivowojafobiki.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/40115267066.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/51f75c8d54e6225bf295f61fa8e09a2d/20008140787.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wifugululudopedi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/85740234195.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/midanilekefoda.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/93698278480.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/67080697793.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/60552978375.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/8447658030.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/rutubakalavo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f319ca91f8---42257243604.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/guzegip.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10596 bytes
SHA-256: 21b0145e6581bd255352cfaa4c1718a48a8611448d3f2f622f458c45b5244c57
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 18496 bytes
SHA-256: 372572cfc4dfae2dfcc94111bc853dae6d22ca8044a6c8f3d84fa5731c5b6b2a
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1