Malicious PDF — malware analysis report

Static analysis result for SHA-256 6659e47d57c64bf8…

MALICIOUS

PDF

80.8 KB Created: 2021-07-22 14:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ff24afca9da825733e1f3a75a7d584f3 SHA-1: fe50c5baa1289553a052145f9f0a45a877303d87 SHA-256: 6659e47d57c64bf82023e44b85a7d31e9f7345580fa20e9bdef9cb78a9a731b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4d74pl3i5o4jjl21tajtji8rlf/fumuzefiranegepusetinose.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/68412963596.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210718133558_486323239.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c230832f90612ef78b1a90d80c2d2e6a/ruvonesekutadume.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/rotonelaxesejakitet.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1698e4501bdc9720ea2608c04cff1f47/27176996649.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/34987198503.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/55583793878.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/49892963305.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3bef4cdf20bd247d698b307742fe9745/131053433.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/24008954387.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16216698106279.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2a061f5b---wowubabobetajap.pdfIn PDF document text
    • https://wonkingchina.com/d/files/sojebusunupa.pdfIn PDF document text
    • https://xistenze.com/files/files/nojul.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/daxitazumemasajazaxenos.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/41053923534.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sojukesofurofonedemegivi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835580509f---vabazarudirajesos.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4530a41363---19017350465.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/77334115284.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/8990201009.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/watorefotevam.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fubupusivasijulekenadafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=multiples+of+15+and+20PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16988 bytes
SHA-256: 9327a7a50e2b4b2b5bd5234de3ed2ae5cf56cbe2b10876dfd7856d98ede09da0
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10912 bytes
SHA-256: 031f14bc88d0f8d6c358fa2f40dc0b1fdb354c4c2850155edbe7cd6dc950f6d9
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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