Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbc0f744c73c2f9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 17:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c94c99bfe9fbf00cc618333fb1ec38 SHA-1: 0984a16653b3a8add18d6ac6eaceb07a65a4e9e6 SHA-256: ecbc0f744c73c2f9359d1ed646cbbbb9267a83512cd8d1b43fef298c231730c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function appears to be redirecting users through these links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://vkp.ru/upload/global/file/15993254194.pdf In PDF document text
    • http://skinct.com/upload_file/file/Fl202109061827004749.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/nazuforekejoramaze.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28838714702.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/67757131801.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/21202528615.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pogasovukuvekamokupi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/takifunulubopigudula.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/81212762039.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/xojexewurokixogukafok.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2dfdd08cd4f071e92ad02bd661fbdb78/51958213282.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/dolarakefokafezumejokop.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/99929109055.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/35155225337.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/70083897200.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9fd21788---fogivumovewux.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fdec93a1---dexefuninusajatoxepotim.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/36beefc016377341da7a4f71a8f90088/30807746936.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/43776549356.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/jedowupimak.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147422382096---9813627992.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sekevelisoromefeba.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/16576187691.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613865ea7b9b9---vusuvukebuzija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=where+to+find+uninstalled+apps+on+androidPDF 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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10688 bytes
SHA-256: c47a474fbff97564f0970faaee1878ec4c0939867f07a43c77b10d452e7e6ef3
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 17128 bytes
SHA-256: bb7f19ccebadb7a320b441fa2fd43ab006c8f77382265bae564e788c52fb38d3
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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