Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0a5fd41c5918e2…

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 01:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 27acf9a0cb42aaea2ba960f75e6a60bd SHA-1: 9908bfc7a2577b7697b30822c9f3daea2a1702e0 SHA-256: da0a5fd41c5918e2a4a3bb8154c314b1ea45337d6c8d081130527c96d770fe75
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to external malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://searchlink.org/userfiles//file/gojesurupekefiv.pdf In PDF document text
    • http://premium-h.info/files/files/bupepobogazaketexof.pdfIn PDF document text
    • http://fluorescent-training.com/file/wigolenevenugugoli.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/445649e4fe5177687b1b8200fa62c0fc/22650983543.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/40385754661.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cbb66a03b6922135c6e72f41e912d612/turugawapug.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/lunamefaz.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/soxijazatozoz.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f626b6b1---xozotu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e303256dd20---94817171186.pdfIn PDF document text
    • https://motoralbini.it/files/file/50512982418.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/61417304462.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fb96094a---pikugu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab9023e6d---wokov.pdfIn PDF document text
    • http://didopack.com/files/33080788648.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/lokufowude.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c6f55d1a---muxoranus.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u5h0ao5jkd8d74ok0usid8r4k2/milobunideziluvukividiz.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/50fe9ad80950e18ef85cf3518521d2dd/64697852178.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/9781316724.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/ragivivit.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bidepenageja.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c93026bf16b---kerojik.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/37084730186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+players+on+a+professional+soccer+teamPDF 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_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 19280 bytes
SHA-256: eabc49ebafafc7590c3795e3e45e9fa8d4db0d29f6a09a4fbc8432529eca74a7
font_02_sfnt_off00014402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 10832 bytes
SHA-256: a7672c87452b7f150aba529c5a206bf7073cfaf6a39797b9de1eead99848aa69

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