Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc27d9ae09595e3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 12:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e25c802b52ad54798dcfa5d8b0dce656 SHA-1: 592255780b5ab2261d7a98bd0d2221f075c1e3ea SHA-256: 9fc27d9ae09595e3490bb7ec56f801016e2e394b1b961bde95513dea67565ba4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or SEO manipulation intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of UTM parameters in some URLs suggests an attempt to track user interactions, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=how+to+make+password+for+gallery+in+android PDF link annotation
    • http://avvocato-callegaro.it/public/file/6130719403.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/23771881584.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lubumimiseze.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/10634639317.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/36094243677.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/genezosaganesuvizebupa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e43de714---xibum.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/38045312828.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f5339d8---89786185955.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/zamasapeja.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130276fe1a53---60644122161.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/wadum.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/15882115260.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/83356168402.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wuzagup.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/51802701972.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/11768385885.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/586b3cbc36d7fa4dac4637ca90216d13/soxuruzuxakewenob.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161385c7a83ca7---61492158322.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/81193455822.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/88841992191.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/27629665430.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/5604243065.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304169bbaf4---zefon.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/15067278000.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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 17520 bytes
SHA-256: a43f3ad4e4dcc4a39a0b7acbc9bbebdb1fe8299ebcf19b5804cf892f03c2c7f2
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 11124 bytes
SHA-256: a5b439e04792d48c5503c0ef789ab9c1625e7fb756b36cc62891c13f74f1136c

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