Malicious PDF — malware analysis report

Static analysis result for SHA-256 866d73775d399ec7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 15:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 215263d2f9a91429fbe43863241a56bd SHA-1: 8ca0ab6fc6cb586e10a3f3e60e950858c7a57383 SHA-256: 866d73775d399ec7cdd0dac23cbd4a594ed99facbb4b2081b23198875370ecfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fashioneducation.ru/userfiles/file/visas.pdf
    • http://nousgarage.com/userfiles/file/11236888008.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085533ce7ef9---tesobapu.pdf
    • http://studiodugnani.it/userfiles/files/56565897143.pdf
    • https://happycolaborativo.com/uploads/files/17133610375.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/bowas.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rra6bh1h2ihtr18csoa3og48eg/rovaxijude.pdf
    • https://beauti-full.ru/uploads/files/wukerudemifugetuvorimilu.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8560c4703---vesenipube.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2dbc21bd---jurasojig.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4cde0e6af387b531ae458d3adee7161a/tuxugenekukizezisesuv.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/66945468390.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e947eacf---joxizebapot.pdf
    • https://takipcisec.com/calisma2/files/uploads/pupututigosupik.pdf
    • http://noithattamphuong.com/upload/files/savogugaxeg.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/viterolekigesaxazizew.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/poxupeb.pdf
    • http://carzip.biz/files/uploads/files/31411727632.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b14a2711---fodasafevof.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5gu5smkm7gtll65iimg70eu0u4/11610309308.pdf
    • https://pingthye.com/userfiles/files/98093178622.pdf
    • http://meble-tk.pl/userfiles/file/98967468207.pdf
    • https://eventaipei.com/upload/files/30851873673.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/xamunijudolaboxiz.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/cg5054an58mvs4pg8hfjb9ome2/pigizodomotakoxepadorij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=colouring+by+numbers+maths+worksheets
    • 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_off0000cc0c.bin
deddd84d49356674c2959ae832adeb13c4830f07eff7ba0a1c0433791d606e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 11120 bytes
font_01_sfnt_off0000e5eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 16792 bytes
font_02_sfnt_off0000fdfd.bin
0f69667107e4c0369c4d18384cee428a755b2a3e4ca94ab83982e15bf213cbda
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 17124 bytes