Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf66bb1c19f8b392…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 08:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8f9a14ee2fcc3fc68d5c4ae14036ace SHA-1: 326effb43d8478637c9bcab3d6b6270c2d3914c7 SHA-256: bf66bb1c19f8b392b38ce4891ae5ef3e49548c9578ed312c0b60f6420140bcfe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://observatoire-omic.org/documents/file/5422700951.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0955b2b73---35529543374.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/63556b04127ec8e11dec52a940bce285/8391456978.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/rexovavezidar.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8426a4694---raduferemebefawawim.pdfIn PDF document text
    • http://trubaopt.ru/content/file/7624929801.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60EFF5B6A23A9.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/tazujotopijubajame.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/ribosatetolake.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/804aa237c5f2bdb62638b9ef03f5abe8/84828144743.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611d518c882a2---pibeminemebibutolokosan.pdfIn PDF document text
    • http://bulmarconsult.com/files/13637872498.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160722f77358c1---19579912558.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8305d78e2---muwawoxufodonefafogarufi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4456bf28a3c2c34e06f3f93a5351f938/3137533150.pdfIn PDF document text
    • http://cmtsport.com/pliki/13403904600.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610450d5c0c6b---panitid.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/90387505782.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c534d21fb38e678532166e7011bd758/41205566780.pdfIn PDF document text
    • http://www.toptehnik.si/images/86397307787.pdfIn PDF document text
    • https://isosklo.cz./uploads/88070147184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=schiff%27s+diseases+of+the+liver+12th+edition+pdf+free+downloadPDF 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 11152 bytes
SHA-256: f1f863190e9585817d6d006d68486efda25409fe4cd7bcb36fd222863114f3f0
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 17812 bytes
SHA-256: 738fa67d0b08362961fc8ceac442fe403645de06b17fa1922bc142ad753c9ba0

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