Malicious PDF — malware analysis report

Static analysis result for SHA-256 53edba926ed9403b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 03:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f66cd2e7b500ba0d5f2128823c0ffe44 SHA-1: 3d23215eb0ec45efd11f6c1f4486b8ac7a4d4371 SHA-256: 53edba926ed9403bb3ba119165396b1450952ac990121a148c4deef0a7b311a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The numerous external URIs, many pointing to compromised CMS uploads, suggest a link farm designed to obscure the ultimate destination and potentially distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2870b09e---zabunawiduxenesujok.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3798a8c2---sonupixefule.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/36311273485.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05658c59a8---toparerunimokirurabiboke.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/ranitosurata.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bd507321efd---26166606143.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6824a9e78---debenura.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/mafarinalubezokijujapatid.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/86095992522.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/c2p1qbi9s721nf4gkdv9vq8u85/45426636209.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/28809205259.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/lerogenafosisozenox.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3ed1c211481747b4840c86d63fa7dc1f/jokojivenalujos.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fc0b7f8d---31692921049.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/mamok.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/texixafukawusediw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607de26ec45b6---36946462083.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/basozowagejinajamugig.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075757088c24---zazuzulagawisajapokiwax.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021523948544868.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/golejexivovata.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612f6751b7---55960011553.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/abfa4a8a42f9c95f50e850d8ae831722/77196464266.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba203d1db1---34944175527.pdfIn PDF document text
    • http://rld-carbon.ru/file/ditaguvaxatubipodexebof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gallien+krueger+mb+112+ii+manualPDF 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 19768 bytes
SHA-256: 5d437bc2c3480d6fc63ed7ee67707ff7507e5437f40e331d32085f0569f2e205
font_01_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC0 10608 bytes
SHA-256: f1afc55f6517e9fc465367536703ee9d4039ed7102a18ef4bf23744185fcb1a5