Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea2c8cd0119aef0…

MALICIOUS

PDF

76.3 KB Created: 2021-08-28 06:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 527a9129dcb303c4978fa8b12614ff5d SHA-1: 00ee568ba23c691cd3ba71acc3024ea709844841 SHA-256: fea2c8cd0119aef0741b4ff7289129392f8ddad69070c83258f48c63df684756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=bible+verse+to+wish+someone+success PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f533c5b170912af8420493c89bb7a11c/gufizufupadewasodufesixi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/59271872469.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2849dd90fe2ff865dc2ec725ad5467db/gavonetutiruf.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/xaxonujaguzagufofijed.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/gevamikusujupixaluda.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xowofaparimewe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43629a1765---fanizufofavufaj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166f94975ee---11125241040.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098485ee00c0---21743783120.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bfae5d50---noponekixiwulufujonuma.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/dokipogisoviroz.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/wogisewifemax.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4f8b977a---xusazowuvufon.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85169d938e---vomarolarofoveguxuso.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bacbe750fcc---97763124761.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/lukisonilozazijofadi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/97651474092.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tuukkqj80rj2ks0fbrklu0nr8i/81788317928.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gigibowakiw.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ae4e305b92c074bbf3ab680931a4b36f/rubanosi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160742cf0ab28c---limugovamazediw.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/japirekivupugabika.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fejinekujesilajedujifarup.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/98de84a73adf7962335746e6e4ae391c/83360618825.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_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 10780 bytes
SHA-256: c7aa240eb90839f937fb4fd2ac9975cf37d1155ed9f44e128d5b6785827a5983
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16544 bytes
SHA-256: 0c1a93ffad33a4da82dc6673bb2ded75e42e2b7b590c53217e1b182ebd8d0279

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