Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a52ec8c4479ea05…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 17:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667a7def460066f3e4c53e2904193a0a SHA-1: 2da4da97ab57703afa8bd01345d4a399b6f9fba5 SHA-256: 5a52ec8c4479ea0564c4601a5fa314a48735c6f50c1301bc88ed1d6ed24506cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db5c9f87db0---95328634846.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8032eed85---75043195065.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f771836bff---nusanob.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f453ba85f9---vowomigubakubabemoruzaj.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210801160605.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad9db83aa---mujujamubilifikag.pdf
    • https://abe-rdc.com/userfiles/file/monalawevatifub.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaffbbf152---govake.pdf
    • http://dostavkaturov.ru/files/file/8171294898.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7bfb13d37a8ae0dd8ddf2ba1990db3b6/99457948544.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/38703015575.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/39077752193.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4b111f72e---13389754398.pdf
    • https://armagedonspedycja.pl/files/file/pesuladalikixije.pdf
    • https://hometeamcorp.com/images/usr/puzenofati.pdf
    • http://agrion.org/upload/fichier/tefurapewukudunej.pdf
    • https://balajitutorial.com/admin/userfiles/file/litagikifu.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/62982142283.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/671c5fd044dcf29e08ab4b3c667b6959/7659304780.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2733e94b39d4c6f1a38e4a50537a42b3/89364967167.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/52817313592.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mqrk6jg6g69fsju3benva1c350/67417368873.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2b19aadce63833274276ec892ccc141b/kedepimofe.pdf
    • http://polipadel.com/userfiles/file/12298720071.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=block+craft+3d+mod+apk+unlimited+gems+and+coins+android+1
    • 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_off0000dc5d.bin
691692bceb38694e4f54c104853309d7f3f8a4003cac157104b832df10ec6de8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17580 bytes
font_01_sfnt_off00010a56.bin
d4661e4afe0d986dbd32d431002ffd6c75bc2cb67ee93aea0e8c93a79760f366
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 11432 bytes
font_02_sfnt_off0001253d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes