Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f25daa6cef4779…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 04:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb41773078acfc626a3b1323ef6643ba SHA-1: de24185dfe09222357e95dbaada074a2611ceb35 SHA-256: b3f25daa6cef47792de0d77c2f39aa64211b4b342e7b3d0bbe18311202dae39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=tanita+bathroom+scales+manual PDF link annotation
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/fesojoruro.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/763628d4852ed2ddac58a23ca6b6eb5d/5295428398.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e6625c4dcc04290d28f36c21574314d6/tulagobixulexidefapu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/kodiboludazone.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/965b9a56eb8d1a387d638f4b5b930967/bulidinofaminok.pdfIn PDF document text
    • http://apvn.info/userfiles/file/gakalifidofovasafawatave.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/jaletegino.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611974d6451e6---19769896622.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a292d7ec3a4---dolanovaposafolir.pdfIn PDF document text
    • http://taxfreepoint.com/file/taxigebeka.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989b5fbc644---wasejapixonigamozuxobo.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91534865924.pdfIn PDF document text
    • http://exosushi.com/uploads/files/52959571393.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bufileda.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/6526941230.pdfIn PDF document text
    • http://sns.hu/_user/file/gijijolubelapizazo.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/ralemimukipepasamegireze.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/14357569921.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/jixixumuraposanamipeziki.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4671aa1---42583337671.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/54373117170.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/37779242128.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e313c7f5---potinepedujuzejutabom.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/95135844267.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 17652 bytes
SHA-256: 379db458d3fe6e3d5cc79de115d39a79d5503e72195886426b458ba3bdb51462
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10696 bytes
SHA-256: a19415b629330ac613cf06de42d04b758e8c41a3ad3cc9542d30424f329c2003
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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