Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e39f6b52d61951…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a58dae20f02095764e1a520974c1c9d4 SHA-1: 4c81cc3a9d51bbc7cae4d1ae422f68c6312f5cc8 SHA-256: 26e39f6b52d6195187da8d8ee9d35816121f2dccba8308643823405bf5221e38
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The presence of a raw IP address in one URL and the ML classifier flagging the PDF as malicious strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=tuck+me+in+bed PDF link annotation
    • http://camel-republic.com/media/userfiles/files/83293486277.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/vogotakuzaxenopivepowu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad73cb0635c---57627372423.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081309045781631.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dbcb44a5---powizukorisadedeb.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6669eed---71238936239.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb13d8f49---nalepodetalutasilati.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aef7a730c32---67943541254.pdfPDF link annotation
    • http://hicoweld.com/shop/fck_file/file/gokinefuzijalaburo.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/41294650333.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/63419663030.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/metotedisetude.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kqpg4k6miaeisa8qv6tk9h32at/38216294125.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/89923975333.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/jamezisemupunupaz.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/u3oram2dkjijesuft1oj9fe3fttkh3pf/8236699997.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/manavaketogizumewavi.pdfIn PDF document text
    • http://ropesadventure.com/d/files/34030497742.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jaxasoworebopivakapafeduw.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/2554535944.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b5bb74c5e---zololubejef.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/murafij.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/43460871866.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/618ef01f8862e173be885db5684f7cb7/lesevos.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/38e1e00dd639d619832b90540433af67/zabadovunisuzisozoxag.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10132 bytes
SHA-256: 2d3baa2ca8c17eecaa938e7a1eba3aa0f13351ce2e38c457b09b75307d28f38f
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 16572 bytes
SHA-256: 2bd41b1c778d6a63f3d954fd388afb5619c7a110c213e3d836e396dce9e85665