Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ee445ef455ca3e…

MALICIOUS

PDF

90.1 KB Created: 2021-08-01 05:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e22a11bfd870da79f7c18de8795de69 SHA-1: 325ff24f60015fdf9069e1b68c33137aa81779c5 SHA-256: 70ee445ef455ca3e8177c4e3bf20dedc3fb4df2415949bf864295c515b2b48a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=beowulf+pdf+literature+book PDF link annotation
    • http://cdwy028.com/uploadfile/file/20210724221635.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/vejofemururaxuponugux.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/milojedizigazaludeba.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zomidebezuxoxasetizuxop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759cc4cdd7f---55186503608.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d5quqc39o1ks01l1b4o3p451tc/demulavebiriloze.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/60840604281.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbcb879e0---99820193986.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/29363440316.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/33947592900.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/2482679218.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bc978d87---lepevetezav.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/6836787535.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/ruxalagazobelozusiwi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076001520643---69565407174.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027a389483---75108278551.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a6db03ecb5b8b6d5650b5452dd58dfe3/dadusojuwirinotobajexun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f131dc49a---xuguwogiseza.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2b1aa8fddc41571f18ac64df4b6c0f24/zokupokosibu.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/refijowixamodogikidekoba.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31e026223edb18bb7bc242fb045fb1a3/jedoduguzinovigujev.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/fabufupoxipiputap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b10730a9b23---ganubunivadi.pdfIn PDF document text
    • https://lapdonline.org/file/47093841594.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_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10688 bytes
SHA-256: 7ba28ed2453f460b5c5a8ab12cb099dd1bc3c7ce2e368fd19282f22d090abb06
font_01_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 17404 bytes
SHA-256: 2282e67ed5db730d0aded0fdb5d4001802c85b46b1849791cdb32bdedfe233dd
font_02_sfnt_off000141f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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