Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94ed41404640df2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 07:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee947c7251bc20d2253e6b91b9b314d8 SHA-1: 2bb8265bf1fd6af2a1a0d4757810fcef985bf438 SHA-256: d94ed41404640df2285e4a277ee2d048ed8516d32df74d0bf19e9ac606f459fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, forming a link farm. This structure strongly suggests the document is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=can+i+make+my+automatic+car+manual PDF link annotation
    • https://clubelsendero.com/img_pag/file/21851560962.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/gibegu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882cf3433b---ruzuzuponukukenajivapik.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e403ba0485---zodexoselipukisututedoxap.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/bovazubijetuj.pdfIn PDF document text
    • https://buyafranchise.org/files/files/31045124057.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abca4ba5a---mepakumol.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/2477534101.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s2ibbdqnpkae9lpo3kmp8dhju3/93935944756.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zezapupusujuwuvuji.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/kewujasaza.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0674a1cfc1a447353b54b06625f3cb7b/kobuzaza.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/15273671275.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/28219569782.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/67356963672.pdfIn PDF document text
    • https://fond.ru/userfiles/file/lulazotuxadebijosogop.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/remewefifedufilo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fc7778bd991a97f93d0b6cafd7070b29/62378583429.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gatopimananelarisumigo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/552409a461937be85fa630f475c39e81/wuwurunisefilitefat.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fanig.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb7fa48ec---67245221882.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q867n61tjsa2j68c59859dkf54/fajigiwamotejo.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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 10560 bytes
SHA-256: c6a1b6f5f1e4678e2025dd827fd5da1c695c99e6f50b0c14db5d59bff2944c0d
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 16808 bytes
SHA-256: 3368b9a17a6d400cf5ef9705b5afd5ccb6e4e01a0739231f04a14d858b9bdfd3

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