Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5599b59ac546df…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 08:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d2698cf8b829e38d77bf3b43ed87475 SHA-1: a32ca9ab3493bf0fef3705704a169dab22e439bf SHA-256: db5599b59ac546df1b157f65e28feb3464856eb7da70d9afcb21225a7e158008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate it's likely a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=reason+of+squint+eyes PDF link annotation
    • http://diamondsnspurs.com/clients/12200/File/46775376413.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a74ac0b2fe07000e9d3ea305d7f53532/gidulekilati.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9372a5cb8---88538433741.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/66113709719.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4f0646634215acb0ec13c133c86e2aec/xujusuxabafow.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/12655004063.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/51391188905.pdfIn PDF document text
    • http://capri.lt/userfiles/files/29766412804.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/75221857498.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/93013182765.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/vepiwevusu.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/58818873222.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050119031334.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f141ea0c66---xagofojemulorisenileda.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bibewulovetedapam.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/jeledixofobozed.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097b76e390f8---bababogevibitodemivebu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/72001191415.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/271ca14830b7d1c6fabbf636b50baf64/pozodojawir.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852005ae993---50858931885.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a24d8c099---sazilipejujebexevutano.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/3614037781.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/5911910508.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ddfe56a5a14d3e3b8cf62489b5ca1200/ditinawelogavovonudoteda.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18628 bytes
SHA-256: e78a27eff03d66f980b1f1b4a6bd902069f2dc08f430b16a23a87e4a9bd98a77
font_01_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 10468 bytes
SHA-256: 968297331034c78c97364ff4f4848eae8fc8c0b158f75b88b79e4536b073e808

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