Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b16fb96b57f14c…

MALICIOUS

PDF

74.8 KB Created: 2021-10-03 22:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00ebf515b34669638f5e7e80e9f616ab SHA-1: f26a81f5d573f171635020ea8c55db5bfa928040 SHA-256: 60b16fb96b57f14ce9847b92ac5db7ba374cf772e1ef63f7404c2d9664ec0e29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a deliberate effort to host malicious content on potentially compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acrclubinversores.com/files/galeria/files/sojosazusutajamesewal.pdf In PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/sogapila.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nigotizosilopufatipodafo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e4121677---48245809539.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/fivufadegasog.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/53155110334.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161572de9389c3---63287792257.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/sifamig.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109030137448272.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b58b0723f435bab90801676228494fd4/votevidasekefukunigaravev.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/kezoxamij.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16140021809d6c---39852296648.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/ziziv.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_003050.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/97195689202.pdfIn PDF document text
    • https://brs.jo/userfiles/files/46470500969.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161410d4bee159---48338184454.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/murawa.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/17561918143.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/folam.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/nasixelezilijoke.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=15+oz+to+gPDF 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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 9628 bytes
SHA-256: 0f41041692b82ad7d1a3fd2ff4697cca1c77ac84f1585a598c1a9d5a5bbf5c52
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 18072 bytes
SHA-256: 8331d3224473be170a0d563c5e23c48ed31e61de2a9900e4be6719ab21e53e17
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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