Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f46e22a4df255e3…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 19:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e6677fae2043258df6c0d76349ec48e SHA-1: cf8aecb2cba21f254576433f43a2f8f0feacb1f4 SHA-256: 8f46e22a4df255e39dc7cb49ee7887e43b28672a9e2763391bb1f38a4463953e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or exploits.

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 https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/38d94328c3cc97baaf8dad62b99a5f20/sijure.pdf
    • https://aedwea.com/upload/foto/31247176147.pdf
    • http://cauthinh.com/luutru/files/16245428510.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608556ebee0ef---85656724565.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ipn68hlg8qd2t88rfk5bg6u8lb/riditob.pdf
    • https://paklya.su/design/img/upload/file/93030135745.pdf
    • https://mgogs.com/mgfiles/file/1064845590.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bba5220cade7d84a52bf15d75e209bcd/40105551672.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9cae212d---rigogovosikazizogopubub.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8efcc5d4---8266282159.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd012da4b---71138949077.pdf
    • http://www.asslar.de/downloads/33503861965.pdf
    • https://emilline.dk/ckfinder/userfiles/files/10211745179.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d081c972---93839182590.pdf
    • https://faresaldabbous.com/uploads/files/serofukedexenisisodeborol.pdf
    • https://kitapkapla.com/upload/ckfinder/files/pifonumegedamebumixomo.pdf
    • https://ludifrance.fr/userfiles/file/vajabomegaluvameg.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/156fc2187bca1fbabe4ff43650ed24a9/40087671278.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/71c0924e91009249d95bc9efec9d3945/13108700166.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfc7b56c9---ruwokejoxigerilob.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/26576354487.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f9a7f87113891b7c68ce8856871abe00/52321385965.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdf
    • http://tw-go.org/files/65706318990.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dragon+quest+11+best+character+builds
    • 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_off0000f5b6.bin
ef5b3a1fc43d4ccce260010d132924712cc343a9bd5632d45fe892a95a61556f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 11088 bytes
font_01_sfnt_off00010f02.bin
dd82095c8defae0ecfedc8a61ffc49a72f2048d96844837e8a9eb0aafa34a62c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 17776 bytes
font_02_sfnt_off00013dd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 16792 bytes