Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eef6f344464a6f…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 15:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 58adfe2247336d9eeaf35c1b1a6db60e SHA-1: 0fc866777b8756fddf2e11c97de19d624d5dce1c SHA-256: 71eef6f344464a6f917af30d6f080f647e5f241272dbf1d11d6a5fb7811ec871
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to exploit compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ets6fgj96fmrla17l1knvqqd3t/42076402415.pdf In PDF document text
    • http://babywagen24.de/userfiles/file/60380298149.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f6npe83e9tq1vktt4botdj0aag/sunege.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/efe062093f63dabe765f5715895566f2/najufulubusotusi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1cf2e0a1---14121868192.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kuzoxixuruwo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ebb83ee0---fulefewujatitapixit.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e555a8854---75044957103.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/113e5e4b17862741ae79d2d119ad29f2/57947219129.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/35012114622.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/78830059343.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/50rlom9vua55upodjv6bodm0f7/49435682836.pdfIn PDF document text
    • https://agatanorek.com/files/file/38091038131.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/vevopimakib.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ded3mk3ut30arp8lmpq1jpok8n/86404522298.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/68257870442.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a9d96e08fa8dc94035f11af05215062/4013073216.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/guludetejuw.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45670666289.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ijjgeq8eh4tlphuj1b9mdqrtt5/kitevuwutugagux.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/42264924079.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b4ec55a7c44792ebf4664eae2816d0f3/76316836287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quotes+about+lonelinessPDF 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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 10300 bytes
SHA-256: 72fd0d7a9eace1d00375857d4ae1576d48c2dee82d4bf5cb0bf4b4ef1cdc49d3
font_01_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 17896 bytes
SHA-256: fc058da10f8c13163a348540f63d123a636e9fb8392058555ef03cc7a3a6b09e
font_02_sfnt_off0001494b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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