Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f05a3254af01c2…

MALICIOUS

PDF

115.2 KB Created: 2021-07-25 10:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0879ad7962f05e2c19301cc6ec9f4e32 SHA-1: cd5e4708d0a9ae706525f2556ed15e6bdc6eecdf SHA-256: 84f05a3254af01c2f5d0d0f69b7d01f626164f40480f9cdab8d08bb8af903f4c
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs social engineering tactics, presenting itself as a fake invoice or a required browser update to trick users into clicking malicious links. These links lead to compromised WordPress upload storage and disposable hosting, likely serving as a distribution point for further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd2247a89---47184911974.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a4048202---55657524607.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1a516198cf9d7e360d763cf182fd1cd/47969197667.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/boseguxegabugapo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7caaf7ce---24964935855.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/taguxaluxo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/34625be3f47266130426c1a55b24c94e/pabokifexogibimonoj.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1d13ac247bf7ed4f7e3d6a93b7ec1219/lebomifazan.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wexedomedu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4c4d5f6f96413004d22bafb5f8eae750/37915775097.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d902c8449131e9ef0ef62af75b04dd0b/49246473936.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9qs2vm5oamnmkc3hsapbp2014/radofixeponejekamujilifuz.pdfIn PDF document text
    • http://digifast.cz/userfiles/banuwikekami.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210518203510685862749.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f6057884---51103660688.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ac77ebd9e4c905f048aeb094a553ad6e/vegedara.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099504ccf18c---76996190092.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/rukovak.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/37653034862.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/tasikoj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d268d175430b56ce48a3607b45296199/33743727241.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gixoburew.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jawibadomozurosutajoba.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/77612217510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vtech+roadmaster+train+set+instructionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 41884 bytes
SHA-256: 2312f1cfa7acbade7d575819e084da6abceade60491118d9d0a79d69a9d090d6
font_01_sfnt_off00015f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17713 17488 bytes
SHA-256: b7422bda79ac32325f2faf04afb2e3d1bfe858678cc6502993d52837cafbaca4
font_03_sfnt_off0001a438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A438 10660 bytes
SHA-256: 1f643b6fab0400ef0253d53e1cb07a446f8228ea3fc299c5b7ba9f1635b5b23e

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