Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd00f5381c92fc0…

MALICIOUS

PDF

82.5 KB Created: 2021-10-10 03:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 42d2aed9904003f367c5459229b3ee22 SHA-1: 4ce6613640ade48f7b490c1928606ec6e060fd4a SHA-256: ecd00f5381c92fc009c35942de915e8cd94eb08e1ede1a1ca1d5e68b4ec2b028
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rotitelor.com/contents/files/86430339999.pdf In PDF document text
    • http://study4student.com/cache/fck_files/file/16331887640.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wikebutedav.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/12050506198.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/kegeranilixotim.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kukuvowok.pdfIn PDF document text
    • http://zaiger.ru/img/file/nenawufexibomepesurobuvod.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/seriposut.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/78282903741.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/ripugogixokujobegono.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e574451367cc705effc83774129c294/78017111374.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/31231399454.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced98a132---mabalofasupesaraweto.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/vurunaraperazudugo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zumodinixune.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092815074660.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/36191874408.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xapewixag.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pijotiwazopituxif.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vonenisapesa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a0f18f5730f9f64dd94f7da8b761d3d/66511687471.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dikekunikuwezipabe.pdfIn PDF document text
    • http://htcable.cn/d/files/fovupavifazetav.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/1167367179.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/86472057260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+heavy+cream+at+homePDF link annotation
    • 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 18380 bytes
SHA-256: 79f68097d2dcf6e8fd839d965e48d988dad8590cf37f4b9d914fd5066dfe731c
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 10432 bytes
SHA-256: 6b2b55b16c20d95292ea9e1042dda7483cd8eaa2e9a3a73f251cd7f184f6bfec
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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