Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdaf575955a88d7…

MALICIOUS

PDF

90.5 KB Created: 2021-09-09 16:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fe03367e502a234fe1a69b574f83764 SHA-1: 2162fceeac5f2d991fd4512181425227167603ac SHA-256: fbdaf575955a88d76b96510b44623e53690ac43a2bc807e9a3f989bafdaf219f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://icon-studios.com/userfiles/file/51281512433.pdf
    • http://secondhandgraphics.com/usrfiles/file/gilimokazofuferusojili.pdf
    • https://s-h.cc/uploads/files/202109041746065651.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8688cb154df8f4e54c4e4b119fea7415/60378652032.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/fubujoduzuwabadonojafopob.pdf
    • http://apcmagon.com/userfiles/52108441635.pdf
    • https://sainaudit.mn/File/15251408203.pdf
    • http://soosanfix.com/upload/fckeditor/file/37504061180.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613424080f9d2---96327301967.pdf
    • http://fese.in/ienupdimages/images/files/majuwekitepubut.pdf
    • http://minhledtran.com/luutru/files/56557742063.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/9670378067.pdf
    • http://www.radio-kum.si/data/files/tokaxunafusep.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1d6a7d5fa4153896c4e549cb15778be4/jepabogenuxudipivo.pdf
    • http://artechq8.com/beta/uploads/files/figopuwivefeziziguxal.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210906150611.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/48217497560.pdf
    • http://bangtutrang.com/upload/files/19725839622.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/64791718257.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/tevudadadugozir.pdf
    • http://abwferrellpkwy.com/uploads/files/40227459402.pdf
    • http://onlinetradeshow.ir/uploads/files/68256778966.pdf
    • https://ceccardolj.ro/userfiles/file/91001262601.pdf
    • http://geoman.cz/data/file/maminifup.pdf
    • http://meijialx.com/ckfinder/userfiles/files/wujunuzimedazo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=beginning+with+p
    • 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_off0000fde8.bin
563c271a3301b4692a00b49053147919b048485d2b51f7b1317f71e1024f0c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10072 bytes
font_01_sfnt_off00011447.bin
75a52dcc1ffdf8f831fc114f02ad4ab0d9b2d4b47d6baa27733ce67c502687ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 18616 bytes
font_02_sfnt_off00014449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14449 16792 bytes