Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8656407c35c80ee…

MALICIOUS

PDF

74.8 KB Created: 2021-08-02 13:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 585f16c470b3896833b9e109ba21bdb3 SHA-1: 1b55592fbaa0b62f3d33a66d5300df6f50ac9ddf SHA-256: d8656407c35c80ee7925499c6470856992b907aa5ac8e282e2f5448a2fdfcb37
176 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, and several pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and numerous links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c34a1b93---18212296852.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e4c17f0f---87720697201.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2da465a678ed580c2c2e784c85951f2b/2452273775.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/20971885072.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a38cb7cbb---22241792989.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608008f958e53---mopubokegijovakukujibibi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/63458391912.pdfPDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3do8novmm76h21tidp9be5ce3k/dowazilirukan.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ed5e4489---41920268077.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecb9b642b---89067135578.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77bcc112d---48783887746.pdfIn PDF document text
    • http://keacg.com/upload/files/28065272491.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609606d92b7de---fafikejidisonimax.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/50767513422.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b67329ea7---95101662860.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/58154403309.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/paxijoxurukevalu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fedemoluzo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97226344f---delorogenujikipuv.pdfIn PDF document text
    • http://mldinsaat.com/image/files/21852379164.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56404a0be2---basixavotemogobowenafukax.pdfIn PDF document text
    • http://gibisch.com/files/files/58012851240.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wepenetewivopu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/257f9d832263ab3af2135862b7042e1f/12980710127.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/90023653757.pdfIn PDF document text
    • https://digiconelectronics.com/media/lubovexuxaduxapo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/worejozezurenoworera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adosphere+1+cd+audioPDF 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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 10496 bytes
SHA-256: 6081ed13926ca4da81f392e1ffb90f65b0c068039e3537efaab0b8b3f6bf3a00
font_01_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 17476 bytes
SHA-256: a3eaa2fa36683a48dd936809dfdaae3bda6d4e2e0cb236b475ee1f1b26be8703
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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