Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd912aa57dd00356…

MALICIOUS

PDF

80.2 KB Created: 2021-06-28 03:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf5ddac7c2a74d5f24654a2a122ca8ba SHA-1: f695788b88effd98d88a2991f29ffac4a0dfd553 SHA-256: bd912aa57dd00356870979b5ed164b23e67d0460952ee854a8eea76479e24336
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ded155d3---15495349179.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160959b867aee5---lezogumaber.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a8f3df20b---misuzosixomusugawik.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12b917746---dimonisijegekowolazemi.pdf
    • http://absolutelyneon.com/userfiles/file/54507383166.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e266a37398cbeecda15c63beee2dbd6c/zajenevumadubuniniriwivi.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a16f6650d---vumewobukuvafipedowozak.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fbrc5e7ku8ctod7b2mlke9t8ko/gunatijiruzaziwikozi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079a54751492---razatobadokinu.pdf
    • https://stef-nancy.fr/upload/document/86994641098.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1895cc955---siseb.pdf
    • http://kursadowicz.pl/Upload/file/pakufivetewap.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6802197f---janekizelivuvedozopumiv.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb2018897---90099116308.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2c283a0f---86253250818.pdf
    • http://esistore.de/userfiles/file/59405410608.pdf
    • https://mytekas.com/UserFiles/file/7697382657.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c778f3727f6---notufikugevulajonesiwuwi.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/621be348b175f179de7184499eacefc7/juvoliwipipojusasubovuluz.pdf
    • http://architects-desk.com/uploadsfile/mofilagefexinujafizusije.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60b503566---jefiko.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/28feuuht5jjtiela0veo4eofqq/tumujudujeloforoxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lewis+structure+for+ch3och3
    • 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_off0000d7b3.bin
9185762ff953e4f5aa7945f5006532dc3bfa9b083910bed983d19a01488dd407
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 16948 bytes
font_01_sfnt_off000103c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
font_02_sfnt_off00011bd9.bin
4bd777ec927b70debb9968e3d44703a12765ec5792ad72a372d285f0f1ba644a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 10436 bytes