Malicious PDF — malware analysis report

Static analysis result for SHA-256 08369d4b425f8474…

MALICIOUS

PDF

84.9 KB Created: 2021-08-24 11:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b4eae79bff837510130873ffd36dc17 SHA-1: 2ea3aca7c9179dac752463d6b8a529a6d9142ba7 SHA-256: 08369d4b425f8474772ef23478df098bdcc6b23389678e77e7803d2c64daa281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=seeing+lines+in+vision PDF link annotation
    • https://baoholaodong24.com/userfiles/file/6548160489.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2da1c42c28d3d9e2b7903c8c171d1878/51355255086.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/waguzapunabudizawumumimom.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kejinanaragiremusumu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc9670dac---kojok.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/15620887360.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/kafir.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/lepepirisegajajixuregu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/77279301485.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/90270878213.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca2dcbc30---66280957546.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/fakobuvarikowobewo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210822043528.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/wopugi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/puleru.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///filulalilinofu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513040716217808.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cede2be7cc---jelim.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c568a91c4ad---podunanolovarakekegev.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j0ha863flheki65sjlppo0q7gs/rirof.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acefa776746---65620960687.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/84008527809.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300d54466b---gewiguwumedobopesig.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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 10064 bytes
SHA-256: cc6ac05e7f49ef7af2ef797779a31d0c1828c43c4f7a68a4895ecd674090569a
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 17192 bytes
SHA-256: c58308f3ff50c5b536cc0b71ab7731f75b6dd36cf10eba4b16b51ee1d6eba394

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