Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e491ffe56dc5b70…

MALICIOUS

PDF

104.3 KB Created: 2021-07-30 00:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a2c57d24b3b2e890d060dbb595e01f8d SHA-1: 444dff731cd157dfca38da9a51bb509bd01f3126 SHA-256: 2e491ffe56dc5b70400dad3aef61fdab3721fe9958627aec97bab833358f0ad5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be to funnel traffic to potentially harmful content hosted on these compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6090841940a09acb657f2ba439a34667/15020489891.pdf In PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529034621.pdfIn PDF document text
    • https://davaocarrental.com/images/file/37920784303.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/xodemap.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bc1e94b9efc5e1ca875076abb635380c/muzupebetebefe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9daadd54a3---72117930359.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/21074803631.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/meselikobaji.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fb5bfaefbef6e9bdd06a01e3323c0d01/9670018825.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/77713714919.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f1e295a33e64d1eacb7b48681b3ba5a9/sizitezufuraputujorif.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/619b3c8b806ff1faa691398df30cda4b/73222607717.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcc61cbd2f---12097385061.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2654b066c4fa9139f8d5d27940b580d5/98314752585.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1304117cd9c84ecc98f23d8a69616ce9/jigusupuxilulutumikeb.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/90627192713.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da83327e9---97918898329.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72eeb645f---wubolomeruvulobo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f184dabf538---60979567642.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/79427204030.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1011i264mu70h0a20tk6q1dg32/zigimumevuvikemedi.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/60234913132.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jedubulijulukazaber.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822cdb000ef---19958613630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2019+srt+hellcat+red+eyePDF 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_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 10632 bytes
SHA-256: 3d6b6cfd1b3b8be32e49b16c76dc1e23f7becf932936f89ce1cd44e7c6777b25
font_01_sfnt_off0001502b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502B 16548 bytes
SHA-256: 7bfff21155d640bcfa835243c2553c79626777235c734c48d195213261f28c22
font_02_sfnt_off00017b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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