Malicious PDF — malware analysis report

Static analysis result for SHA-256 413a06ece1d02701…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 10:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06350c2e0658615cf963c6b53ba0da9a SHA-1: db574543064c585ef7b09b6f1265ded976d9049d SHA-256: 413a06ece1d02701b6a55dd6f8722171b3949005d4e41af3daa6a1a610cd9f8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to lure users into clicking through for SEO purposes. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vildmarksjagt.dk/userfiles/file/71983640336.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4800eab5---sidozobapexegoxeka.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/kuputanesodazatutaruxa.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/51163365472.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c09d4debdd25fa7ba24c56222d91b5df/nejebowogumajepofa.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210901201151.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/piberovewoniponidemowopex.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/215b945f6b2eb82366c3a4d028bbe730/solunugi.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/rijizavan.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/popozebuketaporugef.pdfIn PDF document text
    • https://tele-video.ru/upload/files/vililubupinekapezuru.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/26546517074.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/xalipulebabim.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/45770579023.pdfIn PDF document text
    • http://maxbrio.kr/files/files/43855924500.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d9dd6893---memikuvewolutevoxopuwuwuw.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55edb29e4---luxekovojipem.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jonozuzu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/59220495325.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/xowudegijevaso.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342f8bdb322---kokepadaviguzusuvebetoxu.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/linimuwuna.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pejuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+free+fire+pc+emulatorPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45d601e93---wojoziboxetalivuxu.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 17720 bytes
SHA-256: 409b7aaa6bc2a3f1c5d8c99ffa5bfffcafbdeb259787be8e5f496f63c325384b
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10692 bytes
SHA-256: aef5c42d7d9f5fb585386530978f2a88ee945701be2267dd5e32c83407cb1922

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