Malicious PDF — malware analysis report

Static analysis result for SHA-256 d967f61b01511299…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 04:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7dd9e6cc2b549d9ca7383c10c500e5e5 SHA-1: b8e838ab90ba10fc758cc96bd007f80411197920 SHA-256: d967f61b015112993d738dcd1a90dd0a8647485d670c3f40345f88a5eaf91ced
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=solving+non+routine+problems PDF link annotation
    • http://belv.ru/userfiles/file/pamuwodejexoguxazif.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525104621905.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/sogukuvewa.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/43885088792.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/32520043238.pdfIn PDF document text
    • http://willbramephotography.com/8399768422.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r4qa4bgppl05hborll50uiapkc/85440001085.pdfIn PDF document text
    • http://hevolta.com/upload/file/94892759509.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ffef4520c---15182674386.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f2361e553b9f2ad175f314433a2d1038/38527889676.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/640497d7152849bbd6b37179d250a400/89772751398.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fc7e7f5943e945e50202139588fc558f/rugepelenusipi.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/43885019115.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/juxogomig.pdfIn PDF document text
    • http://zerosquareonline.com/file/nolazilalarexu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/sipobiwazovadavigezejali.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/86780499655.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6921f78fe131ebc6cfdc45f9cb0d0ad0/vomatumipilefipo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/81bbfde83b92edd4fe308eb4b4bdf6b3/wupanelo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dakibokazubabavenadofumop.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ded78823e---pupiruzajisujakifulevod.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10812 bytes
SHA-256: cd3ffe2102ec06f46dc4b838914846b175d34ea80b82db104cbef0a5d68005f4
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 18544 bytes
SHA-256: 558a02fe9dffd16c99a52f06fecf3ec8b27c18cccdea64404cfce3c5fcd1f401
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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