Malicious PDF — malware analysis report

Static analysis result for SHA-256 7716bd7720d19a1f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 15:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c32764e76fe2258c1ef5fbe4a4b9b26 SHA-1: 74f891ccf980ba1c8b259c00c1fddc1fcdefa442 SHA-256: 7716bd7720d19a1f685a888766928c0129d837aa9d18e877537807a48c5fcaba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aftckwt.com/uploads/file/63250085972.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/l80olrfnqtdue2etvgdrth6975/40021787965.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/l2fltnv72bkrcfabhdq57q7e5c/52105625503.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/05988674d34fc0d5648e37941547d815/38297224105.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/nekigenomididuj.pdf
    • http://openendrep.com/userfiles/files/pegofigesarenokoropa.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcffa955e0---nemimisa.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af78a0d85fd---32209061658.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210613_C6B9CC60F5DC377B.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ceef577e08---naduwanifobeselose.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bc83d655f3f31ecbb0c7feaaf52ab1fb/72120904751.pdf
    • http://fluitec.fr/ressource/site-image/files/mijexu.pdf
    • http://digemnd.com/UserFiles/file/kupadibeniki.pdf
    • https://anmoul.com/userfiles/file/29907884259.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/12493996f2f652d5c4b60628a7a52fa5/22226087258.pdf
    • https://anukulagrotech.com/userfiles/file/72916724080.pdf
    • http://magicdiscoradio.hu/userfiles/file/zugololujogevituva.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf2a5e5a9---85532027307.pdf
    • https://ijpdua.com/contents//files/demuzonipuranaz.pdf
    • http://cuspsurgeons.com/userfiles/file/gunowovevexejofubudifukax.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/3093ab1ed6943d73304348de2c712839/wutasoginalipabipewodu.pdf
    • http://elite-nails.pl/Upload/file/pukatetopesedefidijona.pdf
    • http://restravel.ru/ckfinder/userfiles/files/tanut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=find+the+centroid+of+a+triangle+the+midpoint+of+whose+sides+are
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/396b6bf972c68a1a4b7861ce8879543e/52349096542.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e243.bin
98ff3b9e51aa5cd7098a58bca0a976378e2f3b2c16620d33e5833bccc5a9d91b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 11132 bytes
font_01_sfnt_off0000fbd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
font_02_sfnt_off000113e9.bin
5ce46e4a45d7ff74e20896024f45a1dc3838a0c3c80d57d7357ba402da7597cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 16760 bytes
font_03_sfnt_off00014014.bin
cabe2fed004bb8067deee1dcd87a862767dc77278bd13b314bd8d5cbc3a2b911
pdf-font-stream PDF embedded font (sfnt) at offset 0x14014 2520 bytes