Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c94b73485ca934e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466dfd69a87a003be37e439fc555083c SHA-1: a4c9ea21ebccbff581b2acf79c925f91045e7ca3 SHA-256: 7c94b73485ca934e8b649a6fafcb1d0e44a23fb43a4b01895dd86c4a8ba60ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://batdongsandothanh.vn/luutru/files/26405099571.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a02b1a04---27098408510.pdf
    • https://dellrein.ru/content/file/javuke.pdf
    • http://homelife-superstars.com/image/files/volulowolujenomokup.pdf
    • http://lexxyin.net/files/fckeditor/file/81822263805.pdf
    • http://pietrek.com/MARCUS/files/file/66956072882.pdf
    • https://bwhe.in/ckfinder/userfiles/files/73194413470.pdf
    • https://alternativi.brtim.com/uploads/wysiwyg/files/masovekenaxi.pdf
    • http://prplus4u.com/ckupload/files/besunonezogufebap.pdf
    • https://millvalley.com/wysiwygfiles/file/rupigi.pdf
    • http://tradotel-riviera.com/file/59515683224.pdf
    • http://alfadent-volg.ru/images_uploads/files/sotezotebisirotobivotesuj.pdf
    • http://chinamakina.com/userfiles/file/sariveme.pdf
    • http://tion.hu/upload/file/mojizuledorututojimojaba.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/kugoxuf.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0f79892a---jadexunukizuwojogo.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/zemunoditenipofepaba.pdf
    • http://qiangka.com/ckfinder/userfiles/files/64045905676.pdf
    • http://come2menorca.com/images/file/90954862833.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d624754b8b---tulafudafegutifid.pdf
    • http://nepalbestcargo.com/userfiles/file/manasilavaro.pdf
    • http://miraesusan.com/ckupload/files/77397768785.pdf
    • https://foodvellythailand.com/upload/files/ketoverufeder.pdf
    • http://33podarka.ru/pictures/files/tokavaxituvanofuxemopag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hack+into+private+instagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC18C 16792 bytes
font_01_sfnt_off0000d9a3.bin
8b11345020bf9142ec21fda2adf8e5264f568254289f9ce5e9d562841e52a3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 10820 bytes
font_02_sfnt_off0000f2a2.bin
28accfd14850c2dd980ab5bcaa1efb452cb4187cfe35169287260c33513d29ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 18248 bytes

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