Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79397432efd91e4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 22:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 270eca10bebf52e2ca880735d9e6204b SHA-1: b6fabc96cf60cce79c8fabbf46cc07f669bfc735 SHA-256: b79397432efd91e43f236c203e24f0a37bcb5aba9c64d2b4d1d7aa18c37ffdff
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. It contains numerous external URIs pointing to compromised websites, including WordPress uploads, suggesting a link farm used to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=differentiation+of+exponential+and+logarithmic+functions PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/liwivodigepalal.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210902002141859.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jigabefixewevewe.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vewavoda.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/fetijuvilimo.pdfIn PDF document text
    • http://c-amc.com/upload/files/legivazetesidetavuwele.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/simuvagenukux.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3b5763eaaaaba36f3b515a66e01b59aa/85123305494.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gitajefulorebenav.pdfIn PDF document text
    • http://blgjad.com/upload/files/74499850704.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d26641546---kaxudixasomoxibi.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/4014432685.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/03ha6hmhnk5lspildio5fk70ol/dorijiwapikavebuzujuvinuj.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tixizitope.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/79734785376.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/85504696119.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/rotimeguwukinerisemaru.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/25922131807.pdfIn PDF document text
    • http://asvpp.fr/pdf/keveratesado.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/89698123351.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8sbojar56qgngbdsar0qm9t3g7/rubadafaxik.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/jinujolujed.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_off0000af9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 14116 bytes
SHA-256: 6be8f6680ef570cfe06aa20b9698e967b0b75000fab9e88e485fcab263bc601d
font_02_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 11268 bytes
SHA-256: 4ccfc8c5be586e87005bc245f5f4573ad758b34b994fa2342071d6fd53216d86

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