Malicious PDF — malware analysis report

Static analysis result for SHA-256 f186cbcac8024585…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 00:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a334c230f7baea18013509a7a81a86a2 SHA-1: e3ede11ea6799edb4837abe5ce8c29f32c073b02 SHA-256: f186cbcac802458592a81ffbfa622556d81a62bda8bf41284ca4e0d3ebb8f186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=biggest+feedlot+in+the+world PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce725aaf63---44557956407.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/10898331506.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/vivudakuvuvupozoravibu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/s77ol5cl7prjhh9rqd6cn4i19l/84129590285.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sukejebemetobarokaloj.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/93333457995.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/nexopuvobux.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xifapoxed.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/molajalawar.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/22659127584.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770541a462d---68136997673.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/44552927774.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5adf3149---dufadezinunaler.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/33375053564.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v8ocvt7vurc63a3f5f13t7svo5/175953296.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad010688f12---gezesomedaxagudogisanaw.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kebijopusezuxupibo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f96099df---lufebigitipuzezuniba.pdfIn PDF document text
    • https://melz-feu.ru/upload/jaranonuwamadax.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/damazilarazog.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbd9c8c20---gudozekom.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gp8f0kc8kusiqelg6um24bisqd/20883994391.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/48480466627.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210709065927.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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 17676 bytes
SHA-256: f5d87c8524983fcd33999e050cf6829ebb0d303e3a2fe905d10252e152fc40c3
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 10612 bytes
SHA-256: 345a10a09f43af31f462673f4965ef7595654dff3967d69b942d94bc5550863a

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