Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d6e760a1391dbe…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 11:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0705f83ec6c772081f677af1c5922a7 SHA-1: a613c896c3963667d2ddaa02477db296404b61b6 SHA-256: 10d6e760a1391dbeacaf2315602858f8e78523c0092b3be60f22257021e9ba55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://granitabrasive.ro/editor_up/segoxakadomifana.pdf In PDF document text
    • https://hanyauntuktesting.com/contents/files/rosukizerovutujuxomupine.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gnhsbpors6l74rbi5o67idf6q8/8454343907.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8dd56e6a---45146412948.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vugaloximubewelepavofel.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/31193345027.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/7333097284.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/852d4968b50ff5498ed391cd7a499f20/96985254788.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/93654004545.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911084513.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/61910474837.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060834425190.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kenotapokexuf.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tifakolugit.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/nilosipubixatol.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/74679645810.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tugobujelavini.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/kesalusa.pdfIn PDF document text
    • https://fptica.ru/images/file/79152731170.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/25165886205.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/lorivape.pdfIn PDF document text
    • http://idcla.net/upload/files/raxulositizizizuv.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/revizufesurumajekuvevade.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/mopotaxuvodugoduxova.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/xagarurageguravobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+phone+is+randomly+blocking+contactsPDF 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17620 bytes
SHA-256: b2d15fe3eb505790bf416f1e7048e3a2a5863f58d27b2e4e3b25f63fef077fc6
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 11288 bytes
SHA-256: 36469aefc518fe6a59151437cc76fbeecba389d14b90340e844afb9a72dfb090

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