Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97623dc1670f4c6…

MALICIOUS

PDF

87.6 KB Created: 2021-08-11 11:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 378db800db51e3f7bc6f22a1201ca054 SHA-1: e053e5b42d31584cfe8e2baa196873e3f1a68c74 SHA-256: c97623dc1670f4c6ac20870b2399994b35d90378f5efad8968eca637ac430876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=descargar+driver+hp+laserjet+1000+series+windows+7+64+bits PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086843186dbf---xanewu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/kevup.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa48cec4e6---76329416862.pdfIn PDF document text
    • https://eventaipei.com/upload/files/redipas.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a4e00a3bda4dfbd560df627510757df8/revexaji.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f60a43578---78402271215.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/41792433766.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/73698964960.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pififomawujatuwifut.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8ac4d1f3cb42c677fd47d3e22dd02d51/somenaxunibulonuxorose.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/nilatesasulab.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/kafolevomiwosagajat.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dff11c7aff2---28960679914.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kelevonifotojomaxijuj.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/45243169283.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ba5c5061---65021893609.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/matetanuz.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/75389895924.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/bomozarifufokadi.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/86471385215.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210701154704.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/025bce5cbd6b6c9c08ca338c28ff186b/91946469507.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/bozolujisotalaju.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/64860482129.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/movurenivotelalad.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cldrh53u1721m3ddvfgoeicb63/52992240668.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 18468 bytes
SHA-256: 7568e4c41a313ae90da793c3f6355fa48bb2ce031740f9ca17f064e4dfabe471
font_01_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 11688 bytes
SHA-256: 095e6da9d1b0aed92db22ff3cc9f600a7f6a88a3c5ac17cec65326ab374277bf
font_02_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1