Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dd1f3a6c685adf…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 19:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 065aca8861b764b9a3486316fb967e0c SHA-1: 84fd35459d65311372d0b5586b634786aedb1eab SHA-256: a8dd1f3a6c685adfcaa9003be9419e9e504c178cd299d88b5a5c19002d177454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable hosting. This behavior is characteristic of a link farm designed to phish for credentials or distribute further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850af46df2d---semuzojipetogi.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c4b7b096---71185307532.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/58989462888.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3biqsr850c92nr89k76v6aco41/42250730272.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075da32bc00d---rosit.pdfIn PDF document text
    • http://heureka-cz.eu/files/99161985110.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/vapuwutabuxipareradufetel.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57ab141e8---1823940830.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/jilebiwuwitirof.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e40bbbb3a5481f7733f25a80dcef34df/nexodimupesonebiluzar.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/nazeje.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kanosewatuxi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3a46b799dc693724cad628cd42f78047/66700912227.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/podetefijaxifitilavakazun.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1f5f5c6e4fad95d3d7851d25c8ec5d70/8022700481.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a23f111bb4bb057979fdd199bd11aea8/51009707027.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/geotbdvp6mavcgf64v33t538pc/99637244436.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf83b3786---36876848428.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22f650869---fekolawidobijokezu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083636da8649---nujatodefewudivoxetaxo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/61201214974.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e6e6bf4f---51545879160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=class+10+icse+solutions+chemistryPDF 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_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10912 bytes
SHA-256: 317f17cd26841d018481db57e6ca58759f6858943b22e719bf736e36595a3a4a
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 17388 bytes
SHA-256: fa2c316984c22b648319236206f4a00b5399a764abb18dd964e2238214c499b8

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