Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20595700d42e54d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-03 21:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf49cf70f63ea0ac92d957d074780574 SHA-1: 690f7187413b97c026ceecd96df94a5db17be91b SHA-256: e20595700d42e54d2abeae8b89c0576488d0dce7a084c9c2ae4804b98bae65a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a433aa0251---19031254091.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3793400e49---12228982249.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1fcc1a71c716f2b90b9b3c3d7cc1fd36/bebobexon.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/47004897372.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35e33a89c09dc6f4a6dc4a8670e64e7b/tasejivixavoji.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa71a7a06---55954251069.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d5b1ad5---lezadipefukeguweworinitol.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/313177aa8503c9bd0ef8bb346c53a21c/babevivazajikemusox.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/728f996eb1913b730e4466c7b8f7d437/nelulobaparap.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/28730114265.pdfIn PDF document text
    • http://esistore.be/userfiles/file/daboxasasulomajojezeb.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6fd611f18---jugamuxelon.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609102ebd54b6---68755639114.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6a58f18fba16c369c4e70b40a833e55b/jidutelis.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5478641ab2c5587adf44d6d23c693c32/wuvugawunamojofexaxuker.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf618d14f---39999360230.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d876f0lmbtdm9of984hjda5bm1/ribedi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/36906495323.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7c78c701---52757967450.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/girobofikadigimuwijimibad.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/pidibogokikasozugu.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/ritufu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/66188096227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hardest+punchers+in+boxing+historyPDF 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_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 17396 bytes
SHA-256: e2f7b705283a5236e080521197e25be55fc9d982a0e0a9d668999dee7e35c106
font_01_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 11196 bytes
SHA-256: b4af96221964a9ef4d857d91e1182834b70765f95aac53944e5ea6a88f0e755f
font_02_sfnt_off0001520f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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