Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d65e7fe4c99c3b8…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 11:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91513e342400ae8818389a1cbd8e1ee3 SHA-1: 1a7831791951a35eb225e64551e93a5031d3ae0d SHA-256: 4d65e7fe4c99c3b8d1a585fbb4cc4f1f750ff8a4ab38b338ba14eecbb8415782
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter, suggests an attempt to drive traffic for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=icd+10+code+for+wax+in+ear PDF link annotation
    • http://www.haztartasigepszakuzlet.hu/pics/file/98432304396.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2qnpskju1boh4uj7d1v2njtemh/pomoluramerilegeduvojarod.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/gekivewiru.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/jebifafexusafasado.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/35b3127cad6808cf5e93284ec53ce55b/tiwipovuvexomub.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b44dcb81---bujidewapupanesos.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/788ea5a2bf95172a1de781b4b44bea57/sulazodix.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/73969728073.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf0b20960---85956264179.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/693d84ff9a5785cf12fe69a3e7fe1a83/12965074185.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/400160741.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/56915521936.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/viwakedezixudekemuv.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hp06nit2b1hsmru7t75dn21oei/febutupepebibagekoxatane.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/xamemitezivupexirepozux.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4594f08f7---65169104320.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4cbc63a691b6767bb0ccf2d7d058bf47/wuvelumo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a33d5770c---bozele.pdfIn PDF document text
    • http://i-biohealth.com/files/gepobujoduzanemuwa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076617d5fdc3---denurakixoxadelazabawo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a804fbaa947---69482682871.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ce59b50aa19e442b8f0568b72c8dd0b4/14813160634.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dukekekatetemususifu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9410980ac35a17ba82ad20b2d82159d3/letabadejaje.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c7f597b7---19028182520.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 16536 bytes
SHA-256: 3827b16d5a11e5207140d2149da0747c3f15fdb453cf7b5f2c8d949c838381f5
font_02_sfnt_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 10472 bytes
SHA-256: aa144814b43da9b727d6ecb45c583239fb8319e0e8404ed9dcd01ff813555c6c

Open this report in the interactive analyzer, or submit your own file for analysis.