Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b670d294333a373…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 05:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1f8bb56b27529b182a1c8e1f5497f22 SHA-1: 79ede549fef6a5aea96bb938ecf3f0eb0938902e SHA-256: 8b670d294333a373288c73ed978527973ab96e6bd508d17f58ae4a2690c81589
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coytex.net//ckfinder/userfiles/files/12200590272.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bdb27125a79d321e4212464b290b7cc1/28381897282.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eb63onr26bs8ocvne6d4d5gct8/rerojilipukakisakogiwa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2251046c9---filegezuzusal.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/nuad2h8tuem5vapoii4g5sn2b7/pofevedelakavimatoriz.pdf
    • https://zlato-eu.cz/upload/files/derizekogejo.pdf
    • http://vom-ragnaroek.de/uploads/file/rizozigarevuvon.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf52c829c---28344263517.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088734aa53e2---57363421555.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qp0clfbecus8l5rk9nc5jiehv8/65279634382.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ee529298d92c72018ea2e0376b5cfd8c/80480860881.pdf
    • https://securitydm.com/slicice/file/levetojebisuwi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d832f231f---36890675783.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/b144389gm88kqsn4avgumviq7i/47091914303.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db702a6fe---64259949635.pdf
    • http://ooexperience.be/assets/Image//files/10839308323.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ece4cfd1e---xolodajenivofezirez.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafc96d122---rulaf.pdf
    • http://ufnk.fr/app/webroot/files/file/48184062803.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ced79d3c---4522404843.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/57ad254341901878fe9b7694b9945ffb/59300371620.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210521055306.pdf
    • http://magooferta.pl/uploads/fck/file/tifes.pdf
    • http://matsonconstruction.net/userfiles/file/visofixidolavifelik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=christmas+lights+at+the+fairgrounds+2020
    • 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_off0000e11d.bin
c39cdc9aa9141d750575f1b837d6e210d22231d37ce157400fb5ba712c478741
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 17496 bytes
font_01_sfnt_off00010f7e.bin
111ff9a6dc552c7c216a3b5dce718c7de498de735d2336f35ef0da865480048e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 11176 bytes
font_02_sfnt_off00012955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 16792 bytes