Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f074b73a4ca07f6…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 18:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5a0ad82f440d38a33cd0ec1c5d17fb SHA-1: 32e1cc55c8ac357e2df30f2173ae924000c547b5 SHA-256: 4f074b73a4ca07f6062adb923ca773b914c7bd405b849ae91df9b3564153e46a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to external websites, many of which appear to be compromised or disposable hosting. These links are likely intended to lead users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=low+asset+write+off
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4ff74b6d101694a5bfe6b24dd15f66d3/17477258858.pdf
    • https://digireg.pl/upload/maxijuje.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fb66f9212accaaf2956a2c7cf225998c/zapivinutiw.pdf
    • https://sakkestadbil.no/userfiles/file/juwalenavirutexejejejako.pdf
    • http://vizit-k.net/uploads/editor/files/xawixodi.pdf
    • http://gptools.net/userfiles/file/23068321186.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b2baa539---68480553880.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b90a6c10f---wazefotonuxapawafaporim.pdf
    • https://jxloanchien.com/style/postimage/file/degotukojafovojidanar.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/44371741437.pdf
    • http://geobigoni.it/userfiles/files/xexuwokujitiji.pdf
    • http://baovevietnam-vnss.com/upload/file/bagade.pdf
    • http://atek-ent.com/upload/file/88399907630.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/s6p8nn6h2r8u1bre6qe2op2o71/41649680189.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8141ba5e---mavukudef.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081d61753353---jusizozudiwedafenoniw.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/45810665825.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/cd1617bab8064d3a56b8bf01ba64c4a5/pozege.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2104e8254b---46019479704.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mj59gram1762is9tlkv2qf5mv5/25119551586.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/68b610a4e9c30bc5482a527936cea0da/xuwalawup.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i97r29mo6ebehfb8tve0ngsmd9/57909759407.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_off0000ec96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
font_01_sfnt_off000104a8.bin
a8841e679ad45fbb4741379cadba2f2405f08aee79808a976a70896a76c87344
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17324 bytes
font_02_sfnt_off00013205.bin
3013934a30b00dc76af3efcbce58f051e53027ab7151a547d999b94e999e9e05
pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 10100 bytes