Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b29ed1997ffaab2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 05:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e885dde0334e4f6af1b1bb04f8107cb7 SHA-1: f0d9c549c40cc909ca59ce9d3b8d675c518fc049 SHA-256: 2b29ed1997ffaab2672801b631ce9ceef208a684a8f248d717466a18d02df632
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to distribute further malware or conduct phishing. Embedded JavaScript streams are present, suggesting potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/efb80cd6cf12239381cf52d0a1df9c5d/50827238022.pdf
    • http://zs-oilfieldequip.ru/d/files/jepefudomujalow.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/16604204983.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/af65b3da160aca8ea5dcec1ab9a91ead/88188286543.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d7d9ffb40449c6388dc65abbbd37fe73/bepugowasexulemonuxilol.pdf
    • http://jfhconsultancy.nl/userfiles/files/2363553130.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/58f97d95c45ad99588d76e136ab0cc56/wagiwire.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c67cd54d6ee2534c5ef6624789b819b2/78385344052.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/27295985344.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/jqj6d6ghanfm7tbgb5m5v11gl1/94492140917.pdf
    • https://fablab808.com/nbloom/fckuploads/file/xabodapetezopib.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9478529399e4dbcc727ab39da6419c21/julepexepugojeraz.pdf
    • http://nuraski.pl/wsg/userfiles/1675982631.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160856ac120483---98000636484.pdf
    • http://vipacademy.org/userfiles/file/banigel.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3278e4379f---32450295288.pdf
    • https://rosycaffe.com/file/vojutemokiwimegep.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/36c593f8f906ae6619eb8028a0a204e8/23100352813.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/fawetipojelowox.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/wozapora.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed885a6de5b---92705251036.pdf
    • https://adikkeempat.com/contents//files/rojajezasos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c964e21---litazovita.pdf
    • https://tavio.ru/files/file/fuguvupurovagenemawotutu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=euler+equation+of+motion+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef9.bin
d84a9d29d310f672a6ec97bc692bec5339c123793f34a6ad450103a0d84d94ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 10720 bytes
font_01_sfnt_off0000e743.bin
ada2aedbd044baa99705a6ac6f976ae760fbc5331d5f5eabfd4da378a809a5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 18648 bytes
font_02_sfnt_off000117b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16792 bytes