Malicious PDF — malware analysis report

Static analysis result for SHA-256 53008f9088e27972…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd273cff6426e9778570f96e747a2903 SHA-1: 84d1d850698d6db5010a1ba827924a60bad7132f SHA-256: 53008f9088e2797204700d23f0970b7ca0a0aecf4c61db449543d9eddefd92b5
154 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6331

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=samsung+galaxy+grand+prime+display+size PDF link annotation
    • http://balalajka.nu/media/rijuminomajifaxi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/rumowagipudonutun.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/86208062847.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/xemowetelokizijudajako.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/giwabifuzus.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/xepudimolizebex.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dakupanewoninopaw.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40009728893.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xesinozezixo.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/80583028942.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/mofilipelopumim.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/62d88650d7b978853e9a088262a18d03/torakejibetajunifew.pdfIn PDF document text
    • https://reha.bg/content/upload/file/91886932343.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gadesejobu.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/32079227616.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78b1d69ea---61348479707.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/34406391812.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/174b3cdeb5bcf20573f7ec1b28df2f8f/fawurot.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/26197088754.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xumibe.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/melaki.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bijewidilutenun.pdfIn PDF document text
    • http://weldingplaza.com/files/file/muluf.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/87229735268.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/wobemerepidavixi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 18732 bytes
SHA-256: ee01d3326bb76437d26a99c0b9540e653f706f8cf9554991772ba12f0728e229

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