Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87a7640b780f84f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 04:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6734425c156fa6fdb7a4e9aee02cb520 SHA-1: 04a8da7d0766e5c38d5a4c7085a1c29a8c75f030 SHA-256: d87a7640b780f84fb70ababa8d8e946c8869ced433ab4a5580b2289446b89d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=commercial+quail+farming+pdf PDF link annotation
    • http://ouhkpthaa.org/userfiles/75118006144.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/mavir.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d80130a95---tuvokafojoroxafufirusi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac794cd7b51---93692519883.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161003df98cbf2---14425393924.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ec56530097c76c7f0a8aa55ba3571a05/85033798275.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/62319421218.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/69626231999.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4698301528bea7bd937f8650a0e296aa/bomenawilow.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee2f44561---vopadog.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f93743f392b5566d105e14f8eb03958b/30398619881.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/komuravumuzonagasarig.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/47289639097.pdfIn PDF document text
    • http://blueyee.com/upload/file/020642181839.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/52859552426.pdfIn PDF document text
    • http://elma1.ru/!upload/files/ribedibufekumarigunitaw.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/81783940766.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7acb10b4fe---dowimewuwagusu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acee16afed---36560162740.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/72e39b5959c8b8a7db1240e33d5f7acc/demoropuga.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_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 17344 bytes
SHA-256: 75a597e39a66a95e87ced9b0faa3c12f59a5423d7b10443a83a66617e241291b
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10976 bytes
SHA-256: 7f8f571cc221910e0e2f2cdbd3b5330f7b880311284ea9972ee3bca191f474ca

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