Malicious PDF — malware analysis report

Static analysis result for SHA-256 2166eff144c8d112…

MALICIOUS

PDF

96.4 KB Created: 2021-07-18 06:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41684b218364718e78dce3e9bde24008 SHA-1: c52f1316f8c6365b400b3d56023b204d6ed480ff SHA-256: 2166eff144c8d1125bf85bd30806afe135e612e98b07e15a9f3abc6afb46e146
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly indicates a phishing attempt related to parcels or prizes. ClamAV detection and ML classification further confirm its malicious nature, likely exploiting PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576d670092---20502999481.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/febejetebazawidiziluf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a510a93bfc8---fiwulamexofuzasokijap.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a272db6b8b2---getunokubanojetibavo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12b4aa4d0---76538514919.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/61154468266.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/62256569599.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qs5v6uooejgeultrnq6a339m64/86288417611.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9156adaddb---82141314150.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f3552d7e908---lerelegagoxaj.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/c0biofdhlippg0tf8baddso5ih/53002214638.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b40ce99ac---55471099267.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nogukoxafawupomamomek.pdfIn PDF document text
    • http://absigorta.com/E/file/65872244320.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/botab.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32325ca55---wefumazumisetojaroramego.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/73778395056.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/kemixivifogewasedizu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d0f3a509b8d1c2d8285bafea06252117/31464548810.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/37e781322909d2709427d66dbbf01c28/rosovixovunesajiwufu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822c1db8522---27553177300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=of+freaks+and+menPDF 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_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 17792 bytes
SHA-256: 722029f86ff7e498f2e7fcf4e9c253fac29e7e61e0f44ee96a15f524a7fe3334
font_02_sfnt_off00015c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5A 10276 bytes
SHA-256: e082c50d385b3ff22454d1deaff02880a27cdf6cd4d3b782fbab37463529033c

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