Malicious PDF — malware analysis report

Static analysis result for SHA-256 f835606c12e3770b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 18:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c66b7c7ca7aa047f3e63604c9a0abe6b SHA-1: 61912eca62bae05f7ebcee19163430372b25fff2 SHA-256: f835606c12e3770bfedf6a87d813de3c96667c2d97912f549277379470bdb98b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' lure and callback phishing indicators further suggest a malicious intent to trick the user into downloading a payload or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=j2+prime+stock+rom PDF link annotation
    • http://nissanotogovap.net/uploads/images/files/dijafuzajutodiwusuzop.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/82600571454.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/liwunajitarusepezineteb.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/winabomawotabomumorame.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/89175026337.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lokodiwogegazoxidewib.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da95dd431---57107127109.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/35826340168.pdfIn PDF document text
    • http://ukrfirework.com/images/file/94618915910.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/57597546522.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/415ff1883b9f17a8bd254d89e5f06839/40195977531.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e30ab4ea9---50068034797.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/87246705800.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/loloviroluxesurerojexezep.pdfIn PDF document text
    • http://saimiri.name/upload/file/94930670949.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/lezujobizutewefojebemi.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/tipijuwozojokivadiwawup.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/lugun.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/kokatosilibalojofimuwun.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/68315280750.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d0596964---dabofebupalujunenakosuxip.pdfIn PDF document text
    • https://phr4u.com/files/sozawuvonopovuduv.pdfIn PDF document text
    • http://d-innovation.com/upload/files/75342063616.pdfIn PDF document text
    • 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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 17208 bytes
SHA-256: 17d7b8b33ad8e824360b056b9a9b95cac1888f5e1a9d74dac8a7f7c9b84d4114
font_01_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 10428 bytes
SHA-256: a202d1e92ff78416f35b056dcf37d1a5842a52f5a1c1895700986e6bc7948ffd
font_02_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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