Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b7c7cc6c21dd3d…

MALICIOUS

PDF

90.5 KB Created: 2021-09-15 07:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1473e3943a66c334edb0a5f62e2e9200 SHA-1: 9e6ac0b72e3e7b77e35eaee0d9f431d86a78c488 SHA-256: b1b7c7cc6c21dd3dcd6c040e8e963d188eabc31855c122e9e5e7c90d819a16db
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

Heuristics 6

  • 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://namratalakhotia.com/userfiles/files/30290952746.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161413d72b264d---wikakokoxuw.pdfIn PDF document text
    • http://erictex.com/ufiles/files/dosexorefe.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/87331588760.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lijesejurukizozew.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/lodowinuzalerufibezo.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/26840815795.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/94789639690.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f168a86528---45459272220.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c716d511---mexobadisekivawu.pdfIn PDF document text
    • https://31app.com/userfiles/file/54281114518.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a59342f---82103235531.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/18188421539.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909051812209808.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/83982575554.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/51106964680.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/dasesaru.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/tiremusukok.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb8c0e70d---74711423340.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6c90737f---25840107204.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/janigiditadajon.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/61831765016.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/niwubekaposak.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/88317862307.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92418845034.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wuzoritewazanabiwozozaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+process+media+has+stopped+marshmallowPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16276 bytes
SHA-256: d00f1692df822d21e1a5e98ad8b77085329bebac9fa4d66ecc38022986c9330a
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 23204 bytes
SHA-256: 5153fd2c91b6bd1ddfdabb3bbb3b7ce708570101d380bc106466ccfde7660f66
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 10848 bytes
SHA-256: 2fedda7208e7d8c6cb0c64eb6b5f4bb4988ab98ec855daf75801ad571a02ac84
font_03_sfnt_off0001431f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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