Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db835747da8b251…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 13:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 591a3e4045e83bab96ea769e136e8118 SHA-1: 95e6071207190b654dd2be75e54ccf6e76ec9a8e SHA-256: 8db835747da8b2511151243456a8edc3fefaedec2f2d41f617aa7a4094e5ee2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself is heavily obfuscated and lacks readable document body content, indicating a focus on exploiting vulnerabilities or redirecting users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=manual+removal+of+impacted+stool+at+home PDF link annotation
    • http://sun-green.de/ckfinder/userfiles/files/duxiwinawutek.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f658b55c---22154592817.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/93776070739.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/zojodepuvanamurotemigev.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092e416ad878---kunidud.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zanipobolomari.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/59849736756.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99c30798b---pusiwepaxuxavasiriku.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/87765647404.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/49897077569.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf46619e5d9---fejesukesuxexi.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/6518545846.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vopipafuzepuvaxuzigogopu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/dovexoramosafirabeg.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/63328083161.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf501ae39---5791729294.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/78c361f1882e6155c45066bf09e3959b/15008323065.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/407064493.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/30055939373.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60cd1d56---96241916813.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/lexanezotidemupalajiwepir.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/53efdf8f4a7ff08a41dae1f5a00e55af/vuxomiw.pdfIn PDF document text
    • https://hirurgija.me//files/88650265447.pdfIn PDF document text
    • https://abeess.com/userfiles/file/zisegu.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_off0000c156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC156 11044 bytes
SHA-256: 749066884437b0e8304458123b3e9e5fa352819d4e6fcfa7be8b5d071bb66ec1
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 16624 bytes
SHA-256: dcf10f83b31438546e11d6429df0657c5a3922b774f7df21aab73ea472f68c13

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