Malicious PDF — malware analysis report

Static analysis result for SHA-256 36695cffe8bbb4d2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 02:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aadfa6931823bf7cecb899bf9e047b67 SHA-1: 6e784cba0e8ebae0c260cf756516ee88b695ac84 SHA-256: 36695cffe8bbb4d268714f5ab37092b738f474e5c659279f3e28c5da760971ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://archism.ru/uplcv?utm_term=parsing+xml+data+in+android PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c433b29cee.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/mulovosutitupulaluzijan.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/83340953546.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfe666e72---56463042750.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vobesum.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/45991709030.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/37981402699.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/32677705384.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/mupelibivoz.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/limam.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/wejul.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/79813841574.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/nilakilakosopezoba.pdfIn PDF document text
    • https://goodline.by/userfiles/file/govinejokenesawidil.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/67322557491.pdfIn PDF document text
    • http://z500.si/files/sidatale.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/72695187713.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/vupoduxoboxilu.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090917040391.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/gefikebilefet.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ub9urkbns704ou67hdtf019g53/basexivapasez.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356866e1840---guzer.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/setupewabezavufibesimos.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/69080295279.pdfIn PDF document text
    • http://cataga.de/beta/files/file/vunavepukegugesufosonijo.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wuzawopotafaxuzuso.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/76784402618.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_off0000bb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB04 10560 bytes
SHA-256: a359fb4619a3c518d13524aed1a72e0bd33bda6e39853fad9a59482dae2234a8
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 15408 bytes
SHA-256: 7169907044d1f97c511da2ffdaa3ee733a7f961090ba759fdf71404593b28e15
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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