Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ea9437bf6119c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-15 10:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 810379e78f1829d23788eb4dca4be2e6 SHA-1: 752e4ef50c8d4d94445326276e1a1156c4cef5a7 SHA-256: 7f3ea9437bf6119c6e3856f624142a2754b0cf8806f49b86543af989b9049d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious websites for phishing or malware delivery, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=fear+of+being+looked+at
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ab84a7df647c6f7ff85c827e94adcb7f/benalikorunesinurawokuzi.pdf
    • http://cheapmarkt.com/userfiles/file/rarakopo.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088332a94921---fojoresurabinunom.pdf
    • https://nationalshield-uae.com/userfiles/files/38865174020.pdf
    • http://delcinfo.ru/img/files/files/gejuvizoxid.pdf
    • http://taskentcompany.com/userfiles/file/10966594090.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/25b6a7defc7887f4d70bae18e8b8469e/repenemitafezijufusev.pdf
    • https://luyenthitoeic.info/userfiles/file/55475703033.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27da31e42f---33807277433.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d704fd3---99427977754.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e249b89dc1b53ea5f7b13f02305d3bb7/josubukefarobupisupuwa.pdf
    • http://biancoacolori.it/userfiles/files/gijitojikimumexod.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/60200458986.pdf
    • http://np-laser.com/upload_fck/file/2021-7-13/20210713160439463431.pdf
    • http://sam-global.info/files/file/vusatifegi.pdf
    • http://prime-standard.com/piceditor/file/6667206783.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909796ea456---20812468745.pdf
    • http://childhood-matters.com/clients/49507/File/devikolabufazikutategival.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/415526c3c6c9c900aaa6aecf82aca9fd/lawovezulotef.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f08eade915832ebb92839f8f9276091a/56186067956.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e51502ae6---3823587461.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6766d9ea823a8aa9a2ffebce1ecdd68d/42878760794.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dlvmspdbjp1h3n99k84dgklav1/fiberogorajamojo.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa398208771---80399392034.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebf3542c8---5272805403.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_off0000f4f0.bin
a317ec10e837e24fa02dcc9030d26f5263c356ea8f4735faead27597165a1d69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10572 bytes
font_01_sfnt_off00010ce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 16792 bytes
font_02_sfnt_off000124f8.bin
97c4324436c92bee27c62efc58cf463d0b8cdfcaced1901d968fc6c6546f1407
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 19232 bytes