Malicious PDF — malware analysis report

Static analysis result for SHA-256 08995b84041f6f81…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 139f2005f06ba2d6f0852df30d7ffb84 SHA-1: 6bd789f107b51fdafedd5a12a796268065db6b71 SHA-256: 08995b84041f6f81545817ef408b20dc97efac04de08f82917911af3ba29b68b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://goodwill.pl/userfiles/file/mobovavaf.pdf In PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/xemefovudetefi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16112a5d041825---sokowizetovalevubedit.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/visadoletupixukegeburuwut.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/84863537745.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/vinopum.pdfIn PDF document text
    • https://biocoils.com/img/file/11498276903.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f602d9ba0e---winexuzudakimed.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/58077068263.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d9361daf---gonobedamoreberekav.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/68974944162.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/kozako.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/getafugipux.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/534a03db30f61f4531f5113e8e66c2d0/kebopeforuxaverujonoxepa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qlids8vp43gbamfqsh3o7luk2k/sutununigujenumu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/499b898e424ae059bb47cd1f28aa1994/kunubufovofugawukapipana.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/rixunesobinasapedu.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/nuzovuzutazemudej.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/84104304801.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb36e798d88---91830981339.pdfIn PDF document text
    • http://www.centralperdana.com/file/30859818237.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/42497007642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=choque+inelastico+ejercicios+resueltos+pdfPDF 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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 11124 bytes
SHA-256: 4924aec61814c6bcfb18755305c78bbe4636480712c7c7f9635df10ccfa42f91
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 20464 bytes
SHA-256: d79a1b63959b703a224fc82363d0fbcc0333585867e3dd51e4dbddb0c92eda48
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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