Malicious PDF — malware analysis report

Static analysis result for SHA-256 164ccdd8183f46f2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 08:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 923ceeb2feb7db800faa81dc2af5ac7f SHA-1: 0ae35d9ed5387f17f0e1f5ab0e870e1a1e15f66b SHA-256: 164ccdd8183f46f2179c4e5209e46b47712df59c3eec63da31c80d1c7ba6fc64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to a tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://angarakshaksecurity.com/userfiles/file/jedivev.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/l2plm055engck1bsosn02pak20/92646775826.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e47ad417---desazitufizatu.pdf
    • https://benhgout.net/uploads/Files/file/jinogigejabusa.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/kexixazafirotefimif.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/77079269305.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/10885885945.pdf
    • https://alice-immo.com/userfiles/file/jopipiwovojimuwuzukevubez.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/nebinawelezeranoxake.pdf
    • https://tidurmalam.com/contents//files/11720166526.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/50181779920.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/zirafunerunovazisetipim.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/bojobagikuvexopemegufel.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed095f42c---6854530359.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c64558236730afa3944d0b18516347b8/vamodezukumidapi.pdf
    • http://accronline.com/userfiles/file/jimupilekikowava.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ca58886---1256980241.pdf
    • https://eravukappalpalli.com/userfiles/file/xebamefikabipume.pdf
    • http://czpohledavky.cz/userfiles/files/bapalomaguraborufozuje.pdf
    • https://palcev.ru/userfiles/file/kedomi.pdf
    • https://aashianarealty.com/file/zosuverifizalif.pdf
    • http://www.petercar0937494634.com/upload/img/files/63723560249.pdf
    • http://eperon-kochersberg.com/img_db/gafinezizakowapoder.pdf
    • http://cameranichietsu.com/luutru/files/redafelopo.pdf
    • https://kontiko.com/ktkweb3/images/upload/files/liwamebabudidojev.pdf
    • https://hotelangela.hu/userfiles/file/72916098330.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/foragajewolunibufarufof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=everyone+else+is+a+returnee+pdf+%E0%B9%81%E0%B8%9B%E0%B8%A5
    • 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_off0000c070.bin
7614a4d6a6a9da343a3a4a394ac36dc1b3e8c3bacd766a4ab6bede9e266690a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC070 21900 bytes
font_01_sfnt_off0000f873.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
font_02_sfnt_off0001108a.bin
e950fa68d0280b20474b3d14e347d0496add841e19a3c8a1f5bbbbbd846a83dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 10756 bytes