Malicious PDF — malware analysis report

Static analysis result for SHA-256 4864c8c381b65c9b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 08:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91d7ef464463837ebb113da5a1f23f9a SHA-1: 2037f8b6c931866eef4d87a2ae12d3a641c5e4b3 SHA-256: 4864c8c381b65c9b9fbffb60c2bb18e1a81afecfb176e1cabe985cb380f6ed49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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://synerhu.ru/uplcv?utm_term=hotel+transylvania+blast+mod+apk PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5641293b---dabokanagedeza.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0000d6223a116d007ff358e06242cbad/kilixavewet.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/81763586996.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0fe8c584575b8532ab7f8944a5ecb381/28710301828.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68854663317.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/11889954313.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/41458552844.pdfIn PDF document text
    • http://wenxuezj.com/images/File/84175799099.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bofab.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/suzotirofitototuxinux.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/72893890278.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109120909237480.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/756f67a3b44d8f64887565ceaf1f8729/12386123061.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0cbc4467a7b9fefe4d07ed6e7b8477f6/52000708732.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe359fd28---9091005625.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210911142052833.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nejoxanokuzubemajadudugi.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/17298888390.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/suxerikosesipipixogilane.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/gawadijozuledinimam.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/govuxi.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/ranoguwuweroded.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210909071307.pdfIn PDF document text
    • http://nenorm.com/files/files/gufatovulewalepawumujoga.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tamiwuligewunarejonelobuk.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/98080731584.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 10956 bytes
SHA-256: 03b0a6778311da9e8ef0ab847bb4de2f5a6cd982c35fef82404c2bb2266301f1
font_01_sfnt_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_02_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16736 bytes
SHA-256: bd215dd4bf04fff4580c494d3cc7cd6df6e9b051f7b298ebf8beb15a1cb5bf73
font_03_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 23756 bytes
SHA-256: f7b17bbb5179d8c89c35e07f043873b07aead0b0ea8bcb01dcda26fac1514bff
font_04_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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