Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcae957e86f75a8a…

MALICIOUS

PDF

182.6 KB Created: 2021-07-14 00:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a8bf9f33f085e8e12859787fdc7ed1bc SHA-1: 2414873825bdde6940db784f6b14f307a2d2fe91 SHA-256: fcae957e86f75a8af210545385bc03c6b9df0f048ed2ef6f3e2e734a4d5fe483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, with one URL specifically pointing to a potentially malicious PDF. The ML classifier and ClamAV also identified the file as malicious, with ClamAV classifying it as a phishing trojan. The presence of numerous URLs, many pointing to compromised CMS upload directories, suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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://coretry.ru/uplcv?utm_term=phantasy+star+online+2+subclass+guide PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0953a494---tuzimugi.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zemefejupawazajupixedopat.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cf5edd5b4c6277358927d3b684f2b122/regez.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0d105f52---lawizotuwoleleseseguv.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962cfac9ff6---fidodopomezi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vazonimit.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/subuzu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/663fd2594b0d5a97e481f4abfaca5f45/52960923125.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9tjv4s24vsgpdhfcuvdmublk0j/23124836347.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/wagenejavufuremaxuda.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/86092107401.pdfIn PDF document text
    • http://jonme.net/ckupload/files/tizotamumobojurijos.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9c44da16---fojere.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/56349644561.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65c9da59e---95021082908.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c36ed37e039ae747ab2b8bafcc07b9bb/befodemavex.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/lomezanelowarawepolo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c0ve1tcaa5n4dqpgoop59inhfr/14536873859.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/40158028054.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160865647661fb---gimazijuvegonexupik.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A50 18672 bytes
SHA-256: 2115e1be7b2e4496027e0b71bbaa77dff97d536d319857446367539e3fc92b3f
font_01_sfnt_off00027baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BAA 1856 bytes
SHA-256: c9fb73f8d72d98d6adff53043e90d45f9b27f0539edbe3b9539db9677ff78a5d
font_02_sfnt_off00028460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28460 11124 bytes
SHA-256: 8b02023579ffb7af5dc3788e34786f7af974fd9e8d01630dc26eb0185b6ff3fd
font_03_sfnt_off00029e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E24 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_04_sfnt_off0002b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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