Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49012eecc67fbd1…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 14:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afa4da41dce15383c9d89523a1e41485 SHA-1: 18a49621f99776c42f0be69cf3dc2ded9b8216ea SHA-256: b49012eecc67fbd199f9dc513b2b44ba76172c949a2344965c7c80412cf46e3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristic findings and numerous URLs confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q0tivm4j0dq4qs08fmva5sdu3k/88889573638.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbbd1ea52---liwafukoz.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1dfa51a03cc8b58564c67e230ad7a8b4/sabowipejurezen.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/92320945383.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lsg55lbeh3lqsupd65v66tkpn5/16836694413.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c65a8627---rexuze.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25815601c---nudaza.pdf
    • https://avenue102.com/uploads/file/46557436478.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2e474c38---1591316291.pdf
    • http://tebsc.com/clients/84181/File/4906126839.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/75j31ha6a6lg1mm13rqntblvd7/jixav.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/875d053d217cd59c13c1860d1b03309a/71091666987.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea73f046f8---nubijokorelurezilipumewel.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e5877f2a1aad8d4d398f1d49d30abab5/65413005965.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebef7912b---42138810076.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/aea4fb792dd456404450ec60a44c2d54/87457302864.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d6621db77ef3a766caac66aa2dc24c7e/66653129294.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/84k85npcuppmn0dvcpuccpo95g/xabikasuwuvijegaj.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdda315dba4---novitokusasajamigogikafe.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9019c008---29364880241.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/g3068ajaoh93r00e1v4rekivhi/vinuwijukakupatirawetazoz.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bc4db9a3a---8634529244.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608334207eafd---13072446936.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ebc2370d9c1ed869e1a8e7de92a86177/japanesunejokisevuvoxofej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=colloquial+german+the+complete+course+for+beginners+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_off0000f067.bin
5572cb043783a5f9caf663991ef6dd0ba32723a29ff43d94e95e4abc3750dc8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 11484 bytes
font_01_sfnt_off00010a9b.bin
3ea42d34a620063a95e44e1d4fa5b39ddac8006af6990bcfe46a38ff31ba3472
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 17708 bytes
font_02_sfnt_off000137e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 16792 bytes