Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a35f72f8d98e008…

MALICIOUS

PDF

95.6 KB Created: 2021-07-16 10:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffdc272569ec8d8a9028a41fcc9e90c0 SHA-1: 829d260853ded59b7adee4d3d3e74a3318579eaa SHA-256: 1a35f72f8d98e008b663c3d9500cbfe0dd6ab65aa255d1d8c5d910c47f74c1b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of these links suggests an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5744dfec02e665db5916ea46b182a63d/6106405390.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/25370863710.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608173f618d2c---dovojoxezarularavumefuvid.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6aa934fa1acb827a5b5cd0e2e3c3fc08/xuneretel.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/megez.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99a4d7f123---vuganadapuje.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bad16163---bepiwenegonimixiniponexev.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/90386420957.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/1a282ee020a93584eead886bb94b0cf1/29107573030.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/66466189829.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/31553065762.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/30713133025.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kesujimebepubu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d5f86724---lonuzikejep.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/ludinonofetukiwajetu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92912927bd1902e1bed12300e6949eda/80453097956.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dc956590---65022092041.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/55f30d97f9944446620a68912acb2a13/86889152332.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d7c9c3qgr7b03e4rfnfueagcl0/20531905273.pdfIn PDF document text
    • https://jobtiara.com/files/files/dobinekudekuvelododisozez.pdfIn PDF document text
    • http://intergeored.com/upload/File/70664999979.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8ftkd3sr12otreshrpp94kldao/xesopodunukobeg.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gejusinisenimep.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4eg90hji3ue9mq5loilun58eun/rejimeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fulcanelli+dwellings+of+the+philosophers+pdfPDF 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_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11064 bytes
SHA-256: 660c014d5017b2fc3e3a12071f09674d7cd700d6c563dfcdec9df796030a7a73
font_01_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 18484 bytes
SHA-256: 6e0091d296eba94a47492387981dc11dc3e734e722611e57c336904b8c2775ae
font_02_sfnt_off000158b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1