Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7c1f843e5c1fe8…

MALICIOUS

PDF

107.5 KB Created: 2021-06-27 23:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29f1bfe08ec99f3188f294cbb2507838 SHA-1: 50602f578c00b279fd3f90e1e93b19a0c6319e32 SHA-256: af7c1f843e5c1fe87a6ccd1fbfbad3dc5cca8252711cd82337986d028e000fa1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=the+aetherium+forge
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26123a1819---30657123587.pdf
    • http://busangh.com/attfile/fckimg/file///202106027568_899231940.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/568479d9c7de2e33f4ec5e3a7eac3763/62611183543.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9e24c0bd---fulimomoxirefafisuwox.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ddmh72ifsrscq5liq72vs1f7vc/26818449229.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/euroo9pcpi9s0m4h28dth5aq9u/75638119252.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34eded4cd---1130731632.pdf
    • http://nusratali.com/userfiles/files/45344490676.pdf
    • http://meble-tk.pl/userfiles/file/zapepe.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee57e318---94834526797.pdf
    • http://megalightgroup.lv/uploads/files/61287980672.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/30a23cb9df2f28e757dc31abdf15cbad/junumisusejipesimise.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/85310865812.pdf
    • http://93564497.com/userfiles/pibiluberupuwi.pdf
    • http://portalkucharski.pl/app/webroot/media/files/15987868844.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072023c688d4---safasowujiliv.pdf
    • http://nfc.soo.jp/file/50193825274.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160896b242c8e4---nogagisexuwuvujozagarered.pdf
    • http://amghanoi.com/images/ckeditor/files/99245026054.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5185bdaa0---20503924486.pdf
    • http://yogo110.com/userfiles/file/20973593892.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rcbjla6fvh4d3ti80dbqupj9n4/vulixepowog.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b86d4448b---mafifagawitojejaruzawewe.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4c0c51289abb946c0dee058c4f383a61/77803770327.pdf
    • 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_off000141c4.bin
9ad8eb6539ed7999058626285892752d091e0a58d18a3fedb862e17fe342a962
pdf-font-stream PDF embedded font (sfnt) at offset 0x141C4 10408 bytes
font_01_sfnt_off0001595b.bin
fef0b771b5e4ecd02c9bccb31b9382cd8a519125f4b40b446d2865f5056be4d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 18768 bytes
font_02_sfnt_off000188e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x188E4 16792 bytes