Malicious PDF — malware analysis report

Static analysis result for SHA-256 3625faa55ca84e8b…

MALICIOUS

PDF

95.8 KB Created: 2021-08-13 13:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0bd122e49da0ab7e1c7557ed5228a28 SHA-1: f221f9fe7942e31898afb1fd0a9a2a4625b560d9 SHA-256: 3625faa55ca84e8bcaebb533b028f78986fda7dfd82ce93dfcb357295d713a37
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kjphotocon.org/data/userfiles/files/67754455041.pdf In PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/78645480927.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c29b392c---71683551549.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kedafobobawatuni.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/90931446295.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d9bdd1fcfee1c15ce104112a99af13bf/63262827977.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0daea396---pekapimorobonilawoperevim.pdfIn PDF document text
    • http://castel.lu/userfiles/files/26983389741.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/buwojed.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/57a330b863631ee55bdac9543673d174/fewabe.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gufasabexafanosivinugim.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/70523380938.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/terezetuvetako.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/figigi.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/juxase.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/tepelusumutuvoni.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9299e00---pefuvezire.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jisuruma.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fhouodskijrpftmnt3r3mad09l/75182775840.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb195fed6---31223041667.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/14156876773.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-16/20210516053040621242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cu%C3%A1les+son+las+bases+nitrogenadas+del+arn+ribosomalPDF 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_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 11044 bytes
SHA-256: 37ff5d0471d689d75eb5e081c4ecefa84b9638f6a171eb4e26bf7439f1d502c5
font_01_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 17988 bytes
SHA-256: a103c5f146848123ae68a76c7e971dedcfb4f6ab2d95faae13011e074b6d5fb3
font_02_sfnt_off0001561d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1