Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b125b15af8aed6…

MALICIOUS

PDF

88.5 KB Created: 2021-08-23 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e294ac5898615fc70d7d04eab6596c0 SHA-1: 440a7134991f34a15c52286755e4b8002aeea3e5 SHA-256: e0b125b15af8aed6cf2c8f9bdc20ddcf4f292570f5572ef37e9e5f9cd4b46f06
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many external URIs pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=solid+waste+management+research+paper PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ih6im1vi8338o6potadfj12k86/bozibikazimakujasojox.pdfIn PDF document text
    • http://rideco.hu/upload/file/gewupatikodepobas.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76f80296b---wumewoniwu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40897250c5---56867369383.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/zutexajaj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17ea16e14---5217615480.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/zojuvase.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1887b4d78c---tumosirexevubunekuruxo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9911757c---19446009131.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/bopedema.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/44861001041.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/sawixus.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/13814072464.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///petogulalenevatafitorebe.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/rotogalatimowuposuwe.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/kuketoxurusapaxoxabod.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/97boj2ab9hen3jr1bch0784qu8/vodadakulede.pdfIn PDF document text
    • https://activepymes.com/pub/file/42047878965.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a395337cd8a0c95d48d14ac437440dad/gevuremaw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa7f869d53680b8ded25f4eeedf2da47/41307243402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17432 bytes
SHA-256: b19922548153f3dbf8f5a626901753b6d380f4d1ec450cb0b2243e7e27e3ffa5
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 11120 bytes
SHA-256: c579d7e5d566f4f1d46283a5e7552d40ba74b32bfa3bd2ad5f2fafb81b2d7d81
font_02_sfnt_off00013ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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