Malicious PDF — malware analysis report

Static analysis result for SHA-256 1836767b4d331e38…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 08:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f12d8e717697e127ab50a094d0ce1843 SHA-1: 8ac40c221972d58c245ebc2e08d3d17fc24f8672 SHA-256: 1836767b4d331e3822f9c40fc1876f0e0749cc719c1fc6c688b3a3c2f571e0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=fervor+de+buenos+aires+primera+edicion+pdf PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/678f78d42e4a7cc8522585c16aa899fc/860027184.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2085169fff4e9f321ba3f7b010899e38/vilefibazagizozubig.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/piwilawimug.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/36345953617.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/puwabibudeliga.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9e4122f43aeeabb6d7e7877a33822563/38837658573.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n68uqvl5is9mfo1g95fnr62rm9/zovetupime.pdfIn PDF document text
    • https://raljob.com/userfiles/file/29562202187.pdfIn PDF document text
    • http://emannsltd.com/userfiles/kubide.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/02/file/20210702_095615_102.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/57185650342.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e2555490---pugej.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/16859373713.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xofuvitawow.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/64670416912.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9307d8e0---7073787367.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6a4fe076bc9bce8222179dc7a0cf58a7/xipisutek.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/49904389602.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b54ebc979---32717468581.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gowodegewi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db531a5357---siwewutusevomabawiwu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/srqknmc7muaslmghgab1fa82a4/29654887715.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090da1ceb3b8---tiburidavutapitotez.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/temonatisukavawixovom.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa321cd922---70395583526.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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 18208 bytes
SHA-256: a1ebde58a8237ebace493dc71e49ae6679d9bd754136fffa7fb9421a41b72a61
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 10920 bytes
SHA-256: 7b10817cea4a6d139c934984c8e193f8c9c6517eaffdffac555e7b3c6f6f424d

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