Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee932c0991b0bab…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61b06bea539ec060dcbfdf23f30e3c9e SHA-1: 5c7af3c954c80a5d85bfc8923b6e084e6371b8f1 SHA-256: 2ee932c0991b0babe7646f66c2c760bd59434624eece8142d4b3700a983970cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites, which is a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=como+ocultar+pastas+no+android
    • http://antasboru.com/guvennet/resimlerfiles/59721352036.pdf
    • http://abaj.cz/UserFiles/File/61751202714.pdf
    • http://daiwavn.com/uploads/image/files/vinenorafuwajefi.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xenowomadeniwarovesugol.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/wubamapujusisujolomapusak.pdf
    • https://calendarsunrooms.com/userfiles/files/42420606128.pdf
    • http://madmojo.com/fckupload/file/zelarerog.pdf
    • http://elfast.ru/userfiles/file/85041547186.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e887683a---mununatatodajabes.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135219da5727---kazurimuwejudunese.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2k9kps31rb8ecoqi5v1g2smfu3/bojutez.pdf
    • http://didopack.com/files/jatifopuxulef.pdf
    • https://sona3elkhair.com/userfiles/file/16205394729.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ravutiravusilodajurabeju.pdf
    • https://kingdom.vn/userfiles/file/nevonejufubifujibipa.pdf
    • http://kuppersbusch.hu/userfiles/files/lisoxisirisebefek.pdf
    • http://share-world.tw/userfiles/file/tajelepefezobinumaxufunij.pdf
    • http://rld-carbon.com/file/14357134441.pdf
    • http://chataphan.com/file_media/file_image/file/81233821745.pdf
    • https://camelcarpet.org/d/files/meverafobim.pdf
    • http://chinazzjx.com/d/files/43248044779.pdf
    • http://gaudi.tw/upload/file/nagonezuxevixojeg.pdf
    • https://virtualpulse.eu/UserFiles/file/56160192797.pdf
    • http://inggeo.eu/userfiles/files/nedugujuzedogiwefiju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f8.bin
a211cd264d8ba40f0e9506f2507f865ba38dafbf32450fc901a692c8c58df4d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 19884 bytes
font_01_sfnt_off00010a60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
font_02_sfnt_off00012277.bin
2dd558f1cb036ad36edba96d1f16b89568f3222290792280a773e1553cf0a627
pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10676 bytes