Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9ff5b9e69ec74e…

MALICIOUS

PDF

80.8 KB Created: 2021-08-20 07:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bac317420ec32531c27418d65f5b3bb3 SHA-1: 88163ad61595bf6b0e664f6fa41971156592c7f0 SHA-256: dc9ff5b9e69ec74e5c086c4b7ff4bc0901fc6da85da0e8e0e556e1fca3d13c44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=libros+para+colorear+adultos+pdf+gratis PDF link annotation
    • http://calisnt.com/uploads/files/donegidalirapula.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210629_A235CD7A7150E5BF.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609270a102322---50453958681.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/sojako.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/79371867827.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/usge14pq7c1vcq57288fjj5efj/78062879296.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xutawarotavafu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zufudasisedimegoxag.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rr55sn2i0tdnu4tj32tauqjel8/15888449506.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/48f53deea7b7a87b343309d94ff756c1/rusumijawikokesukozoxen.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/vejopoli.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/10842581889.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/pugefomojusefufoxi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/1057401627.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fusowivuwi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xizexokona.pdfIn PDF document text
    • http://fittbikese.hu/files/file/74107821462.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/339b3f112492e6721039a3b0b5f4dca7/tojebobe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610a132565805---87751070558.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13e9e1764---nufageletewukule.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/49a824f1d0fc6f21882c13f768f643be/42057346249.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/vuvejekoxani.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/105274304140db6eaff2ea570a52e0e1/81410951330.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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 10888 bytes
SHA-256: 936b25dae78a7b5d3a269581fdf7e9602bca558f91596d7c59ac4622791c83c3
font_02_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 18084 bytes
SHA-256: f6cb77c17e4672a6087a1d5f9f4b766cc3ae39fc59806137ab5a8e91fe5b4956

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