Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd94e656574b64b6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 08:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46ce0a50954d85e0dbe7b88b9e1243de SHA-1: 9c3cc57ae1073d9ecf3cbe5dae7be02e9e30e439 SHA-256: bd94e656574b64b60c12b0b17f27d4236637323004326232e686b0a55547c22a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised CMS platforms suggests an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=how+to+install+mx+player+in+mi+tv PDF link annotation
    • http://ayurvedicclinic.org/userfiles/file/56722213597.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/podilejuduzukajumun.pdfIn PDF document text
    • https://terracell.pt/images/file/rakunate.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/90762446950.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/11657936277.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/vumodoserena.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d362b24942---60859721368.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/tukagaramajireriza.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/nizuziwiwokefiwa.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/42855213223.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/medafe.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/15369304635.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hccv0jn1c7gl5sj95fuoigsu34/94410782636.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dekebase.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/29416254788.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/83616843273.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d338144d48---47662988107.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dq3c1bnm035nl37mklv2tfimvm/45657330462.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b962f04d---jojisepuj.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nozuruzufubegufubixas.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109040245325747.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jowugez.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/gaxowemobijipane.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zigolupuwonizowizubugar.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10772 bytes
SHA-256: 6bb5c8ca7b1abb2a8d5e10bb9d73e233e7f393d9c5234d090c1f2d25bd18ea4a
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16436 bytes
SHA-256: bbf295f0f8c552bf0a940daee116a39a86d12d437cd49aefedc876d54c8ed6e4
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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