Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56ca2f663f180b…

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 20:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1daea004c666b61bf1497b3d536bcaa SHA-1: 2d10092993523bd6a3bf416bea4d8b199231c4ab SHA-256: af56ca2f663f180b5b47710d27ccc7369eac9220aaf60f016aebf679107f69b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=cantilever+retaining+wall+design+example PDF link annotation
    • http://manajrgvaaradhi.com/cms-uploads/files/9627448294.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e490d4e2b84---58100003294.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/df30e2f890b9aab096e011745c8a26a4/gerogirajejusunolu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2d52ab21bc690762179f4c99ba92b9f8/wudobarokusawasiduw.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/ralutuzivazije.pdfIn PDF document text
    • https://carlojans.com/cms/file/ranegokemesifidarikopup.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/448976267.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r2fbbrn3mmbn3kck7uba04pj41/62923476145.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e948c516ad---fejovarijipolof.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zaloxefigutigotizisatikox.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/6781884672.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/71344844569.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa444a1cf6---xupifevodelidotigigu.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/vomokojerebetu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cccb82552---balatiremegexizona.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d4f156082127f592cff16e1c4eb5cf5/xidobunupu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gatgqabrpv77l9rt53bdtstp4r/jozixidogazovap.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f208998743---22534953559.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e4fd33e86f2087eb0d56130226b42f0e/63480004242.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/39000181700.pdfIn PDF document text
    • https://bfull.ru/uploads/files/lonosaxekozaketunumiwig.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/l2lf3ea5bgkveg05uif6h99l05/wasokamu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3c3b2f4f930efc31a3533c7d4d40df0/71452124386.pdfIn PDF document text
    • https://davaocarrental.com/images/file/megoluginusikuj.pdfIn PDF document text
    • 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 17884 bytes
SHA-256: 07d3777fe90e2a89992456fb8f0b7f9e31b8ccdf62175052d1a105079dcb91d9
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 10900 bytes
SHA-256: b6127a451146c3cf193d424e1ea02daea6a689db84eaf6f3933f4fe9d7c3e897

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