Malicious PDF — malware analysis report

Static analysis result for SHA-256 c167bce578d40b85…

MALICIOUS

PDF

84.8 KB Created: 2021-07-24 06:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad5f7788d0f927cea45dec2328172c33 SHA-1: 3924e5d13582b3b2f81812ab9631e69ba0fa6f94 SHA-256: c167bce578d40b85aea67686dd12cffea1322223f4f876362d7b18d5fa322c57
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple links and the use of disposable hosting suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studiopedrazzini.eu/userfiles/files/logitekawodunekakopu.pdf In PDF document text
    • http://starsunited.at/upload/files/vogumupi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427689afb---vesetubuvidajo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nulejutavagoxavebolivep.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/16406408546.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/jubiga.pdfIn PDF document text
    • http://kd-council.com/upfile/files/36560577474.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab04d3c4---miterojimipuzu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/kuvokufiped.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d2d4193fa---90624611025.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/pekabesemuwaxasileputadax.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160752abd8eef4---fibikin.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/5577801333.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mipezafanijirepoti.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/vinoparipedugule.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/damaperimedezuzi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8b9950c888249eec8f725aadcf367b22/87346339765.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/vifuvajatiwoxewonava.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/rolapigipunopezuxeva.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e11ef1a80---wikasokiwulebapo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2642ef872e3229a3d5184384190e7a90/87051332201.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/83cfff7f3e17dc2ec75b9d202b65d41e/11023321863.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/bakumetefoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+resueltos+de+integrales+de+potencias+de+funciones+trigonometricasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 17724 bytes
SHA-256: 75fcb9396da5f10b9b8eb3859f2d8917f682ee661aa62cb8f6913924208943f1
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 11176 bytes
SHA-256: 288ab47a599b9598162f825e3c61f14fdf03118f798d8a11cf3c511563bdc6f5
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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