Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c899ca919588651…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 23:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eff842d063a064055d270580e9acc6bc SHA-1: 2d1569673abec5118c0777eeebffb2feab518ea7 SHA-256: 2c899ca91958865167dc50db67f8e82a939d3f6d98ac4c2735ead88f7a42d68d
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external malicious sites. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crewmak.ru/uplcv?utm_term=red+eye+remover+apk PDF link annotation
    • https://abcoegypt.com/userfiles/files/34085024647.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/97718468350.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/20396761784.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43add112a---luzakuvi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/7848124981.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/lolokaxirorofufaxogurefi.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/fupinosuwo.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/tidupunikenu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wiwulonon.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/jowenuwonozomexisomi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cn8mtgreis48ldep6qnknv0i4i/31728491655.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902040443.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/kadivaviwoke.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142465c83fb7---suxodetomiwozinevoboko.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/silemudopiwo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/puvifirise.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/44645509266.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/38638792825.pdfIn PDF document text
    • https://latework.cz/soubory/zatekiwekudolefa.pdfIn PDF document text
    • https://botroul.be/uploads/83804693882.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/puvivixozapimizo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/20306355875.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/josoxuburivizaraxugun.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/89043942217.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/tojofimiselovopet.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/58874074500.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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 10360 bytes
SHA-256: 423536b8c345b9c16da8739d278950fae01e995ea5deef06202398c9df7eed0f
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 22536 bytes
SHA-256: cc0287d585b994527fea4e0e32a33bfdb8d4f4264fde9b6bdac2f5069258cc36
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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