Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c4a02f6d43b540…

MALICIOUS

PDF

84.6 KB Created: 2021-08-26 13:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6107d3eb8cf2b09ac14624903b9eb738 SHA-1: 40911f653a7b9d5bea04239692e0de3c1ddae7bc SHA-256: a5c4a02f6d43b5403fc8dca7afd1444f1385ae7c3f640620c3f14762cb2f4d96
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sammyuriasproperties.com/userfiles/files/45047154890.pdf
    • https://atlanticcompact.org/userfiles/files/nuzilagajawonejelamoxip.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/rakaneginebu.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5473e1019---ledumivamawafitebipakuj.pdf
    • https://uangraja.com/contents//files/98856110195.pdf
    • https://isosklo.cz/uploads/65685028181.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282717b915---30020913439.pdf
    • https://anfauglir.com/images/file/87285473371.pdf
    • https://clubsecurite.fr/webroot/upload/files/94237107589.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af776d08a---dupogumiji.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7430c3f3a---mopanarunesegawotoko.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/11dc4964184e808a06c73772d753a5be/48153676556.pdf
    • https://twinslock.com/ckfinder/userfiles/files/29594307430.pdf
    • http://xn--eyt274i.com/upload/files/56320780964.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b95e9b5c4---nakames.pdf
    • http://haithuanphat.com/uploads/files/14645050545.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0d7a79d95f19991399be8181384cb96d/58585439807.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608294cd68460---80556915503.pdf
    • https://begili.com/uploads/image/files/57812257109.pdf
    • http://kvbm.org/pds/userfiles/files/61123715744.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a9c2ac0c42887ea74aea084bad4348f7/kubafunukajadenowili.pdf
    • http://tafgambiatours.com/userfiles/file/53688241361.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=toes+%26+tips
    • 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_off0000ece4.bin
01caa7130517d534a6e611d6c101951e73d9bd59a40586f607def0db486d6e77
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16836 bytes
font_01_sfnt_off000118b9.bin
9194ce4a72f998b36d1891f0470a064c1a0c7f6afea2f765db38451f407752f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 9456 bytes
font_02_sfnt_off00012d0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 16792 bytes