Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded776405179f7ae…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 10:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01b8f02e98922b5f770a3dfcd23f3a21 SHA-1: 027dbbad09a2f22a72d4198003b656c0996ec660 SHA-256: ded776405179f7ae3d133206281b84b7b68c189ecb456b3b874dcd2fe3f32028
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a71e190f0b59bc0e709480b9566e337/mepajozimuzo.pdf In PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/vixofufovaxowigomemaxule.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/10742262413.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/liwutefuxexejiwubixodid.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/86457837200.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/8692725578.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f2458dedfae5a9b1cf15ac26728d10c6/4870450162.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bqbeaba9ur6m1a9de48gsgai2r/14995547681.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tldka1no9p05ol3ddh0gs8uumb/12871450540.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/84815081966.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/58932188325.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v7f91349j3oc43j0brujdtvhi2/biposeb.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/padabewisat.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d70d95e24025a9401492db05f7803a18/49162549794.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/diloj.pdfIn PDF document text
    • http://epicridesnepal.com/files/38332592801.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/82228737537.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/43177728894.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8ed7687a---mupevito.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/31525707623.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8b538b7a---dasajeterow.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fgqjshed625qhu24ceua4sphcr/45317701980.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/52342504228.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985555b28fa---65450807132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=musical+moments+from+chopinPDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 10840 bytes
SHA-256: 4d4282735a43bf44e45df43382cd8e3e0e3e8937bf1ada9f167705edfced87cd
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 17980 bytes
SHA-256: 89f84109c8415fc681d1c640506b0ef84dc1ff947227aa73cecac90ab4042c3e
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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