Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d73246bd45e095…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 12:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 910779e389f1b5d362ff2568f5e29682 SHA-1: 920cc69d56c90ecb05bc37a324c1bcc7c8638ec3 SHA-256: d9d73246bd45e095fd389587fc67c2e696a9ff57cc5baf93e21876bad48bc2d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+accept+blocked+calls+on+android PDF link annotation
    • http://daonshop.com/files/fckeditor/file/25835411318.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/dekimoxadolebumefolil.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/daxitusitafimuzevanigu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415504403d0---66830791425.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109110322211551.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/94560437057.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/zoruzulatedadaxubixik.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tilegivexorirara.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210915_091900.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/43303877602.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/voziperatifelana.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/tevafakadi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6aaef0de15f8fde5a8ec5b16fa1e2cb2/tidogobokotozufitujiramo.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/falukig.pdfIn PDF document text
    • https://congchung7.com/upload/file/nimopafofe.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/74150938297.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/82261343055.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tobejezukeposudeb.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/76016790324.pdfIn PDF document text
    • http://k1a.ru/images/files/file/vatuvikilizevupe.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kefoxeporelibupemi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613483b99a916---39211016987.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/77183414861.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_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 10816 bytes
SHA-256: ed86617681efb68cbec8148437a91529a96657a3bb56aa21b10bc8a0aaf4d2ce
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 14736 bytes
SHA-256: edea66d1c3de1d551bcdffe967dc6f89b26f067756c11a6c03e86ae48ce09fbd
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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