Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b1f52ce1781c6b…

MALICIOUS

PDF

108.7 KB Created: 2021-07-27 20:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37dbdacae3980e46768396ce6999e449 SHA-1: 6bf11ce2eef7c8106901bf95c9ea5b24b0d17236 SHA-256: 74b1f52ce1781c6b258dfdea8dd391f15500d72e7d67f4d8449ce843b5642c61
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 or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://krzeptowski.pl/file/8448583451.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///timoreba.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2945adb83---bubaganagibef.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/papemigilepixolaboxesaz.pdfIn PDF document text
    • https://sy-tech.eu/file/93994944536.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/bebinosezibadenasotumap.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16078960bcae28---delavuvojukamosadexedeneb.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/pifewejuseragun.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gusetarikekenitadosaf.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/5792117071.pdfIn PDF document text
    • http://vuason.vn/upload/files/vomofiluxabufisodasivek.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/92452514396.pdfIn PDF document text
    • http://riph.pl/userfiles/file/bunuvunidaneno.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847e33c6577---godusilakeled.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/49778790245.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67b3030d9---jokanimajufamixirukixe.pdfIn PDF document text
    • https://777mto.org/contents//files/lawixub.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/78bec0c5c12dfce567c30ed892d23c63/gaketij.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19e27211b3---wuwifidoworadugigukax.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/50480956714.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/75949918398.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/toveluribu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb14417481---26936411298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=which+roomba+is+best+for+pet+hairPDF link annotation
    • 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_off00014758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14758 17232 bytes
SHA-256: b28543b98bc302824997b0e1e2b9cb0b98e6888113de1b47ecc629fc902e8c17
font_01_sfnt_off00017466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C7D 10728 bytes
SHA-256: 6fe1fc5070e247937a73e12236ca9160c8dd74acc8b56a41b2b13ce09728b261

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