Malicious PDF — malware analysis report

Static analysis result for SHA-256 8120da31db2773dd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 06:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 992d13454923aacf1baeee4939e56278 SHA-1: 38b4933ee598f67718d29af396a8b4d32b3da3ee SHA-256: 8120da31db2773dd445742c64672245f3da78082bfa931389251113d6ed982d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised or disposable domains. The presence of external URIs and link farm heuristics strongly suggests the intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=lung+cancer+screening+pdf PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/kojexenepolujimimosumup.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xevewazegipidemalekedikep.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/90107071044.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xagogakoti.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a24cf341251---kerukag.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c84ae40---pevevuforezudejojasiwam.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ecc3ebed50ed87cef0744d4a70351923/nipezuzunodifikim.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/24747781239.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4c187d5381236c6616bf6bbeb34af65c/11712254487.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/qlnr7tl2v82avv9l6r2q4p6n43/93651824634.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2874678b5---83249500125.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/caduk336bu7e9s25vdd26a9732/zepipiw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94f82220d---jowapawep.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/80a2952d74128fda0605344e6e8ab45d/60363274873.pdfIn PDF document text
    • http://omg.su/upload/File/18244405400.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/24f9f79aec998b9b78a65020da0f44fb/4808113462.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/dilafevibuwufud.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c544bce5c---tituze.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/wumupovunaxisigidur.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/64929446323.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/remevomiwevevu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 18176 bytes
SHA-256: feb5940541229565b4f26cee166ba652d50a8dfec9482eac46d65e5b7f24d2b9
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 10588 bytes
SHA-256: 71379c194ff10ed6bea2c47fd775a6ca2d035ed397c3e3d1a8153769071444a2

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