Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e15326ed89187be…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 14:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfa52b3206b309276f8aeca2ea8095c0 SHA-1: 81383ff57e3e34c8eb551de94ec37e878f14f823 SHA-256: 8e15326ed89187be1d787d669a2601e5b66962beaf0725b31fb42487cfe0adf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c43e91408a---bulatag.pdf In PDF document text
    • https://tutorbolivia.com/userfiles/file/lasaragedavujawutatemojo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h5qnig9tteh816cq3pg4da0c95/26044254225.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cad66a9c2---87711800034.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///48087902601.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073db957acbb---63071584531.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/babemepanajifaw.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/fimofaxeduwigesiju.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/bopolipazajosipiwerakisa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lcl5qbq32ec1mpduic91p7a689/67349059401.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/32892288181.pdfIn PDF document text
    • http://teplospectr.ru/images/files/69929512303.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/44862118648.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/80192647532.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/35535643386.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77858c10ed---vunoruxosatufato.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e16d6b4609c---rawepejamalajososera.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/jakoxudevelivu.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zovozasexal.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/konosodobitisowisavuzim.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9732d08fe8bab9b0668bf4b6fc5191fd/11747477137.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/budasuriniwinekime.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363361b3fba---26545022387.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d6958e85b9812a691a551cce1b6060b6/tefirenanowuduguvon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=needs+vs+wants+worksheet+kindergartenPDF 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 17500 bytes
SHA-256: 0bcfd33c267575920d71ad961b3e376a9c74be5478e71fd3c4dab1969edfb5e8
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10700 bytes
SHA-256: 0fd561857c0ed2c899477d61314f2ded1a26cb01f2f3d0ac955fbc1f0a85198b