Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e40426eb12e73a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 19:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4059bb9bd1f7dd970f7b1dbd162a9c8d SHA-1: c585a8eb6ae7845e4ea750f958a13a16e7aa44fd SHA-256: c6e40426eb12e73a09ff214da5894627af63fec2a0e9f870dede8762ba1a69bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://expertsystemgroup.com/file_media/file_image/file/36700832153.pdf In PDF document text
    • http://blackhorsesc.pl/userfiles/file/nuvejojemurarexojuzitetu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba9464143---zajew.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82134272417.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/tupujazosipetoxuwu.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/91358630993.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/45009542111.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf023bef7f5---13291173380.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/wusirukolip.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a383f3d01d0de4c0aaef60a9864488af/33905421157.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/76173680100.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/ruzefomepusiw.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/firatimetojefu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/konezigomojigiverane.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42417988151.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/58344933357.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160801faab76a9---47967092581.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/48912639446bd06a52b49ac8e20f8fef/jenod.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nafoli.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/givigopozupijab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=echo+dot+1st+generation+manualPDF 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_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 10952 bytes
SHA-256: 921b868f181e1c64c7a1ebed5c04d97fb502e21a7614203a565b4f77290fc27a
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18016 bytes
SHA-256: a990deb3d073f724ade1a7e7196f3e0782710e888ebf95e8e8a84200cc578ecf
font_02_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1