Malicious PDF — malware analysis report

Static analysis result for SHA-256 c162365a339b517f…

MALICIOUS

PDF

101.9 KB Created: 2021-09-13 20:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d1278ab6dc76eb5bbc20ad37b4f4d09 SHA-1: 6a12863c75bdabeba05a9338bfd1ffa07622c2ba SHA-256: c162365a339b517f3966869a919b4749ca359d048427e77d218e28d03c2cf571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic firings strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=top+5+benefits+of+technology+in+the+classroom PDF link annotation
    • http://etabetasurvey.com/userfiles/files/30466860838.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/xefejubixumilinewuzatajux.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62535200468.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/74669748956.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kiterenane.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xiruxepogekisaxipixituv.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c4f5725499a59e45354b478041060b4/ziviz.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/tejabolaxesexubilese.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44422556749.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132f60c2c205---dukanufuwikefodadibotu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11084556d6788106f6fd200ccbe3245/fegujavagonibejonofami.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109062104394161.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-10/20210910034753726263.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52b52e1a3---18607185276.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/66745173504.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nuzujij.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/38640256700.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-07-12-29-30-90.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/39548382682.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/liwukuzoliri.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/43144520905.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/savegudepopubusomawazu.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/67872880811.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_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 18200 bytes
SHA-256: 30c6a2fa006ef4f04db72ede4816d85f9b2df74bb09bbdfb19fbe425393f3d56
font_01_sfnt_off0001570c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F23 11276 bytes
SHA-256: 45e62eae238f56a0259ee59698fecc1fbf3de62c5ec0dab5a6f2cc5dd6778f2b

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