Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e91761901223956…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 01:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 512d15ec381b724ec4be7a55bd09de70 SHA-1: 4ab3ec463dc112d5e2b4e668fc92da74e87bc2fe SHA-256: 0e91761901223956d1e9c84d767ae9b2bbc6a8491db956cc1d853e2f569f12ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=android+version+9+update PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18a036df5---64679411079.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/38757548799.pdfIn PDF document text
    • http://bubb.cn/up_file/file/tegemivinoveja.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/37vgi8mven4ec5u8up17urt7e7/dulefonuworimitido.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/28679455222.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/neduxejatisofujagage.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/3160258632.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wegudotevakazijexol.pdfIn PDF document text
    • http://video-cycling.de/files/file/memimubiwoxed.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bulokarezedobagafofatimej.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/99158457204.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rabasojanalanu.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210908145717_OTcxMzE4NDk5Nzc=.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/62734352421.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/77071868777.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/buxozusiba.pdfIn PDF document text
    • http://a899.net/userfiles/file/rolewinox.pdfIn PDF document text
    • http://dogable.de/userfiles/file/18949387900.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/pojizumuroxutadadenuliza.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/43066447829.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/keguv.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xewumivowekeranupedotab.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tobidonenifojux.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132b62c97995---bapogowikoge.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86376339638.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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 18380 bytes
SHA-256: a83b622f3170048ea7310db72a0d17c96eef2d283436257c6d04e2478f4aac61
font_02_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 10656 bytes
SHA-256: 9a0fdebe72a787af04f7efd15edde1bee0a9c0c134c5d3fa10a561a7ffce3f15

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