Malicious PDF — malware analysis report

Static analysis result for SHA-256 f454aaa1c4611a7f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 19:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a58a76fd455932990076095091a7ca2 SHA-1: a28e73b28b287d071182b1b9c2dec4ffbda4d2a0 SHA-256: f454aaa1c4611a7f1199cc9062a5335f3832363c99a9da5ce72c6434c6db0b77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, forming a link farm. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=java+ui+thread PDF link annotation
    • http://multi-accueil.fr/ressource/site-image/files/13871740653.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/zolenadezowunu.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/susuwax.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/42983197443.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/kuzisutinijilugukasu.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa3422cc1---gojudogikoso.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/vozunedibozonu.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/37393335331.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/raroreruwodokisalawo.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/mewoteb.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/jujerojoxawuv.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/disadereredijodew.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/67604083741.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6ce430ce370185c9d120ba5e8bc7937/nuforixid.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161303de8159b0---48148921950.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/xidezosidejaxobaf.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/lasobuwububevaxox.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/38433610122.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/monumoroduleso.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/39233147790.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/mulidenupunaloko.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10064 bytes
SHA-256: 8780276efa1c2cf19b1ee7e0eceb28a67695832e9415703d26bae59316e422ea
font_01_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16780 bytes
SHA-256: 3a5cb2725e1eab9b5b6877e5baa2db6e825d03e54cb7b73ad00018ca64d4a08c
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1