Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3100f97eff63c08…

MALICIOUS

PDF

100.7 KB Created: 2021-07-14 08:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5c7f5d10364253cd57760b6ed17ad54 SHA-1: c64b287bfed87ec8d5690c31c074b477b2d24107 SHA-256: b3100f97eff63c089d7ec82e827e1ceac4b688920c18840eaabf23cb03adc974
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aptchasers.com/FCKeditor/userfiles/file/rowibun.pdf In PDF document text
    • http://valeneighbors.com/userimages/68977787323.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nitibo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nulamiri.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e29f5a122---sosujufu.pdfIn PDF document text
    • https://rajaunited.com/contents//files/59353066132.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8f964fb---bovor.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/92455675244.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c149fc0d---80133511542.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890047647b8---88684224726.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/57210988286.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/46078901456.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8b5c26c76cb440f8fe430d051bfe3297/zerapenekexutaz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32dc9ed2cd---fegawukabikosili.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b20df505---13222853470.pdfIn PDF document text
    • http://yanartextil.com/firma/files/50151380890.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/5051953380.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/gozogudapozikuwunemoz.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/29433448947.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/kilipi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/81972250529.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/86qbh5aqlvk58cjnha2cch4k13/vulaxufadubokajo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abff34959cd---besexudefawo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xifozizagasimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=low+key+product+photographyPDF 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_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 10732 bytes
SHA-256: c6a2c9b48792e31f80445e299ca0139fcb3c97460972b90ba153a9987690dc81
font_02_sfnt_off000158ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AD 17208 bytes
SHA-256: ea241374af88b4f11841ae82af9c9ff2d99525fbd18184b7d5030f624fbf8185