Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d05f765ec9ca900…

MALICIOUS

PDF

78.2 KB Created: 2021-10-03 05:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b12f08819aae842b80c564d7311f984f SHA-1: e21b470ee948aef951319cd800aa9e0270bb26e5 SHA-256: 3d05f765ec9ca90069b017123dedfd15717c60a9a5c4ad7303341af1e65005f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, including those on compromised CMS platforms and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=barry+nelson+casino+royale PDF link annotation
    • http://escrima-rlp.de/userfiles/file/tifeleselulaku.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/dunukulinonutatipoxafe.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/29261124535.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903143230714836.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/6853740211.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/11529231468.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/42204639197.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344df5ab458---kojuru.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/28026684743.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9075a1ab0---8118670111.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/6074911338.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c29ef2c65---nivapulumapu.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lufozewit.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pigubimufetamifak.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/2589399833.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wozugodiduditeb.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210916002322.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xaxelanibaf.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32ba4da5---silawejubidupomob.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614997464593b---4231142694.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/waforugutel.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/wetugumorolitikifev.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/sinaposojazu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/63470583420.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/28517580948.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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 21404 bytes
SHA-256: ade10e97727af9787068b2f3fb3f42dfb9bad6aa2161e2ee660cffae7ee49c91
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 10292 bytes
SHA-256: 5f9f800292f4b3bd833e40afd83f6ee174708a433976b88f389fe138f557a517

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