Malicious PDF — malware analysis report

Static analysis result for SHA-256 312b301b29220efb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 00:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04841ceb59c445130d11b16115c72610 SHA-1: c6a7a52aa928d4085822abf485be221e3f68fad9 SHA-256: 312b301b29220efb9516c237fc21d05b0c767d6f6368dd56fd83bac21eb050c1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The primary goal seems to be redirecting users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdf In PDF document text
    • http://gerastar.com/userfiles/file/60632979020.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/9751300086.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fikedub.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/56551962503.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/21/23020551290.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/00e31d88c8c89e1034bc873b7d6934ab/salegutib.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/vujaku.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hu9ci4psoso23fkl5pb8ug2n00/75533584389.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/14800423530.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/98ji7qi20nlone1j8kv2t5la82/pakirizixiwifo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0fa01a57e---47955614027.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc08a9aa4---65096920789.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/lirubop.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/63252436082.pdfIn PDF document text
    • http://chayka-svg.ru/files/74486718499.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/e2u1lb54j1bfm58vil748sj7he/56308984971.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zuginuzid.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d375bd92c7b81d3b4062651654538e54/1297211263.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/pefotomenu.pdfIn PDF document text
    • https://sinarwaja.com/account/files/53197981627.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8b2e41e585f83404dc500457aa6b3de9/82369666088.pdfIn PDF document text
    • http://casaalu.com/luutru/files/13737784077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+save+background+color+in+word+to+pdf+macPDF link annotation
    • 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 11436 bytes
SHA-256: 8a745d654ba62c912e57f9c65d25480dfc2763d5287d15d00aeefc6c1c907ea7
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16968 bytes
SHA-256: c098ac5798bfbcd6b6c35f9785978d9c39e29f47dfee3fe5804438582d795bfd

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