Malicious PDF — malware analysis report

Static analysis result for SHA-256 16182fe39dcbd02b…

MALICIOUS

PDF

94.9 KB Created: 2021-07-02 03:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e3f286736adc7c0bede15f3f616f73c SHA-1: 9c76a6279d5e450c038a94318008421ba8c6d85f SHA-256: 16182fe39dcbd02ba65a06541d87d7a005366c5ceac2bc228a1f8b11d3ec15af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://queure.ru/uplcv?utm_term=ohms+to+resistance+calculator PDF link annotation
    • https://cr2tek.com/userfiles/Proj_Name//files/22700802043.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5ae060a97f86502402ffbb567b6de70b/zatekujunizet.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2c813cea---bawojukaluzalofej.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddb4e5ba3---sipubixadodubegawipos.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/i5t93c0gh6cbghpdftcse8pcuj/zipifenoneburifu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e255347b6c---57995071194.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5761a3df9---12092055350.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///94352188673.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/3288759980.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/db13c2aef38442d5b3a2cd7f47e3d962/koxonetojidapeki.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eaaaf2c8---dudidosukujinowaja.pdfIn PDF document text
    • https://kopari.hu/files/file/35445855037.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/galel.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7096561a2---jelawavudolukuzaluxawi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8e77b75fc30f59036db0642d753cbb40/74253764776.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/v48gdalm2a05enneb12l9loho3/79706767100.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fcdd70ecabe3f55e831b17f240a6d63d/6235846947.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/flcvb3trfqvrm3m2qhbbr5p15i/85334211020.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210610_6222BAB9B9C59036.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/33pncu3o3hlsfcdtrk8mk7o8b7/89608488891.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/81883532393.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/74aea6175743dd21b60baa25501a0518/14850627774.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/aa87e4272e851098b0617eebd14dcc6c/gofavuxiwivalipojaw.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
stream_004_off00012114.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12114 17408 bytes
SHA-256: 2e730ff715f08f02ce80c1ed06be73679358c6de61a9976458fc97ba343c2ad8
font_00_sfnt_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 20888 bytes
SHA-256: 024cb265a560feae6e05992a10578ac8db73c8882944ffea35841a9ecd9c9f2e
font_01_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 2760 bytes
SHA-256: 8836295f3770948f9b7b1ab92768d54540fd627619227c2ffcb8a0a396ff0e31
font_03_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000153a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 10620 bytes
SHA-256: bd5ca4d3875084e3e4bd65bf1180199e11eb205f0755b9745ae09ef7e110b57e

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