Malicious PDF — malware analysis report

Static analysis result for SHA-256 280c96ccd4f30ebe…

MALICIOUS

PDF

106.7 KB Created: 2021-06-25 21:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50a92c5431ade6811dfae67459283003 SHA-1: 887c071b923f25b483231b1d5ed0ac4828fe246f SHA-256: 280c96ccd4f30ebe541f58f127ee42e0b0cb6a04eb260909ba1d32272391048d
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The PRC/3D content and duplicate object bodies are structural anomalies often seen in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a28043c4f8bc295cf924fcb6886f7793/93952250888.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9bd23b2cada38b4e2fc0b2da1cb5c2ff/43993098140.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/derh2s2oh67il054s3noc5tmj9/76655771339.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be5bc1384---67247920310.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253064977---39048764149.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ziviligopa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa593a3e104---wofonomadudejuzobigajiron.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9e9ff18f13d216619e65e385b5055f0a/1127051812.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kumaxagik.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbb6e1e49---vevarikafazo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742b2a76df3---vubebisikawufinuw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/76336702432.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/47878468012.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/81392731807.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4982475a68---70547385700.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba609a867---fuwuluvijozupetudagavosa.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lexojad.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/el45dqs1e01dvt381gp130lp8c/78850466108.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/kusemeke.pdfIn PDF document text
    • https://argumentua.com/i/file/36950515052.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9vvtid9vkeka2n7lvquuhumn02/44137661944.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/52279199904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vlan+lab+packet+tracerPDF 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_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD8 22692 bytes
SHA-256: d980ccfa6919512966d6352ebd159d136386794f7d603fae8864e63bbdde824d
font_02_sfnt_off000184f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F7 10188 bytes
SHA-256: 69705cb5a0d9573609e3eb3e7b72a8447930e2aa9a16ce606c02ccd791c15a7a

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