Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90690a2c7452204…

MALICIOUS

PDF

84.3 KB Created: 2021-08-19 21:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af3fbaa58dd073b6261f4b8859db160 SHA-1: 9d3eadbedf0aa76d239683ea19388c386a09af41 SHA-256: d90690a2c7452204fd0825a39bc21f807acb4a93ccfa16faa2dd65dc6ee7be60
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary URL suggests a lure for software keygens, a common tactic for distributing malware. No scripts were extracted, but the extensive use of external links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=xforce+keygen+autocad+2013+32+bit+for+windows+10+free+download PDF link annotation
    • http://fszhenjia.com/upfolder/e/files/20210529180645.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bd00c5e90251a591103146ba32eb9af9/volilaziporujiseje.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/rebedifogorifofagutixero.pdfIn PDF document text
    • http://recviem.ru/img/upload/14232050391.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/84206434232.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/72274661481.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/14453043272.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/7138508949.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4b675cb976cf32104e6f9bdb887dffbc/75686499117.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/xirani.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nenafitonaguxisebobaki.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e3951afe0e691c03eb43fad76d721825/fusawakujorivoj.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/19458268621.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa35d5babf9---niwijofegexa.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/jimilexapuradiketafi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210614060252_inzt7o.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b179e5f25---mejixoragadugorezujizuwal.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e83a8fafd2e6352ce0b5fcd7fe2337dd/64664467703.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/venonoxete.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fenoni.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63d761279c---36597150492.pdfIn PDF document text
    • https://kham.vn/userfiles/file/zazenademagujip.pdfIn PDF document text
    • http://medrea.ru/upload/files/80867221641.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/79316675064.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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 17640 bytes
SHA-256: 0685a53b6dd1e846fdf21b4658d8501b594f08d3dd3049c6c27f7c53ac01e736
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 11656 bytes
SHA-256: feb78473055d1f060fdd4e8d0ecbe908d1522fb9d9784dcffc7174d1e6f8c9f4
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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