Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76f245eca9dc352…

MALICIOUS

PDF

80.2 KB Created: 2021-07-12 16:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c021292270bf9d34009a2a902b9c3ce4 SHA-1: ee38d50071d6a385a0340da1d4629d657deabb4c SHA-256: e76f245eca9dc3524d9d058d3b465268bfd486f2c001cf7cdf7893a72004c98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://remont-elektro.eu/archiv/file/45122745649.pdf
    • http://animalscipublisher.com/files/upfiles/file/toreneta.pdf
    • http://weberstellen.ch/userfiles/file/wugepewiwovijog.pdf
    • http://thingsantiquesla.com/userfiles/files/64706869814.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c616d045f8442a957ec6b37534491439/62506262155.pdf
    • https://shen-su.eu/gfx/userfiles/files/35494114282.pdf
    • http://terezmisszio.eu/files/file/6473054666.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b6q3t7d8padghalaphb4k8nb24/51652670469.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae670410cfa---49646573182.pdf
    • http://digemnd.com/UserFiles/file/lusid.pdf
    • https://nattasampun.com/upload/files/34222307193.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3b12837c92fc2f3980c33461cdccd7c7/31420563215.pdf
    • http://fine-cottage.ru/userfiles/files/94683077668.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/24acb2e71cf4742b7dc345a8b4a45c67/firelonomevitovamas.pdf
    • http://ecohost.ru/pics/images/file/navifudamu.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/16037826988.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffd4a3d6a---12862462910.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67a132c6a---kinawi.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6dd9acc7---74808018589.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5973f3b35b9cff6d7214c1be7dbd33da/zodevagagadonimavuwipuga.pdf
    • http://wsp.pl/userfiles/file/4503079648.pdf
    • http://www.huntsvillepr.com/files/files/fugabiraxek.pdf
    • http://wamer.org/userfiles/file/63428677615.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=1+inch+in+millimeters
    • 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_off0000da70.bin
1210fb8827a8e71712bb18c96fec2c1b75eb6a8286c29fde050c553eea76b324
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16516 bytes
font_01_sfnt_off00010533.bin
1521c4b9a2c600adfa8422786f0284aec9953077f9da0f5d44c401331d00754f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10168 bytes
font_02_sfnt_off00011bb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16792 bytes