Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d2580467fac5d3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 12:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb58178f050a0711428746422d2e2bff SHA-1: 4b40c39c8f2c913478485a69c648325a0b10fc73 SHA-256: 07d2580467fac5d36034bb776ac805de2081b2627a99dade8ae0ec7fae6d9199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=save+a+web+page+as+a+pdf+chrome PDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213211874b---7068181408.pdfIn PDF document text
    • http://lecostationery.com/files/file/forubawakazasavebemij.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/44921884343.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08cb72c87d104623b512ce93626e7e95/batalipitez.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/pakapopemukanabibaserupaj.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/9600247612.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/zufuxapivulozakolemap.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sevarabem.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/37566237834.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/19276614950.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/39204783983.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/71458530781.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/22941637107.pdfIn PDF document text
    • http://bakoca.hu/files/file/durafafo.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/vufuxafuju.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l3pr6u60ckeue15f7mkb05vuc7/jofuroj.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/jarig.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37984193760.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/54518581426.pdfIn PDF document text
    • http://lgassociates.in/uploads/dezirimozarasoniba.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/dudubujufutoxul.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/74598256146.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/temikirijirir.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0f12447f---48319989504.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f92206e57e1a30840ebc7f5fccda38cc/70784676747.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.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_off0000b8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D7 15680 bytes
SHA-256: df643f87d4c433f34fdc73dab89a52a92d717348f1e9a03b7eccd8209f243488
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 11096 bytes
SHA-256: a3ae1ca2059ab562f2de08b7280ca6c39564ce91568b49a1a18487689cde8d2a

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