Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab36ca5ef6588ab…

MALICIOUS

PDF

104.4 KB Created: 2021-06-09 20:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: aa4c823faeb6afdecdad47c59332ee04 SHA-1: c91c94e32da74bd4dfc0e7daaccb40a1db772722 SHA-256: cab36ca5ef6588abc7e13bb2fae4881c1102e14c7f0e8191d8003ab67cf512db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://irlanc.ru/uplcv?utm_term=r6s+no+recoil+macro PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096207dc7e1a---fijuwujubekisudef.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/3484474378.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8059047756.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b851ddba713---satisevogaretukefovupo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e166b154b1---fabutefegotus.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3afd5ee00---diwukusuwatukudebe.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/xadijewivif.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597a030e0---72716903678.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/8556245019.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f031d092d---nakoxesukalakuviro.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b880ca7f8fb---judivusogubokatalalawud.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052805355996647.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0e60688a698a75b9a7acc8f514b9635a/nivewilamugutegazisoxojag.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3490ff2802---62765981722.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d2ff3379---duninexuse.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/naxokizelenasibiponiwori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 3844 bytes
SHA-256: 5d15be65fefe49b8976fd23c40331fa3e5043eb8f0b75642762b4516cc9db82c
font_01_sfnt_off00013cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 5104 bytes
SHA-256: 85dd0d07c671ab90d106ac3625d5ecb7ff45bfff2dcbbe1d2cb195eab6a49414
font_02_sfnt_off00014dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFE 1704 bytes
SHA-256: f9dda934186bb3f8863916e00101d7c7bc555a55ccb672f7bce8e346f7645f62
font_03_sfnt_off0001568c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568C 12120 bytes
SHA-256: 400feaa83b1e16d7ebbf28a6340f12305da5e30479d6d8cb523bef6a16be5658
font_04_sfnt_off00017f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3B 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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