Malicious PDF — malware analysis report

Static analysis result for SHA-256 818423d156fb5bf5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 21:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ab51907e1ef3d53952e19ee83cdf860 SHA-1: 8ee76251206aecce6df13c897567590dc0eec9f7 SHA-256: 818423d156fb5bf58587f540a0708736b35f46a8f6d22188f4f2f4e752a8d03b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is a link farm designed to distribute malicious content or phish users. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://atpl.aero/ckfinder/userfiles/files/mawemanerot.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16090771dedb40---35193562120.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108032326054817.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/92910994071.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a39db859---nujalopoza.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/71380454367.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/72247426295.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/35747782385.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/14058545402.pdfIn PDF document text
    • https://btegypt.com/file/pojabalaridad.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/57697684117.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/400b204501dabc267bf3ce18486df137/4848544317.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/91117626299.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/13282831244.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jotakipobonomigizo.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/firiripuf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd7b09a33---vibafixo.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/3224582209.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kalukikeruw.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lihl2njr90tamhf76h3638h5p0/dofefure.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xujikerolamabu.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/najunobeb.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160700f3ee0177---zarinepiwaxerefudegefek.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1fa42872---42817943514.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b402e37c---59539428342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kmart+steam+cleaner+manualPDF 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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10268 bytes
SHA-256: d6a11a123813e0ca55d953eebb98247eeeb55c0aa55d09efeb6d2171a73fa60c
font_02_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 17844 bytes
SHA-256: 581c5f5b3b7fbbf6e4d746b2fdf3e206b601acca20d2754a4d18dc84637685e0

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