Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5778de66b7e26d4…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 01:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fd5b3be2723e25d528e8da7e0058563 SHA-1: 214c75779de0dda70ea02dc167f6a06764ad0d7d SHA-256: d5778de66b7e26d49974eebdd9e32fe53a8dd6b2414e4cff58a2a25d18aefffa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The primary goal appears to be redirecting users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2fd65e819---dabilepasa.pdf In PDF document text
    • http://omni-links.com/images/blog/file/11344480612.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/70470830518.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/29312008679.pdfIn PDF document text
    • http://hotechike.com/files/files/velevosapujume.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/90428096600.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3291ddc3912f4c337474fd95217d5d57/70198277891.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/35783918736.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pevozewolologe.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/xizufevudinamu.pdfIn PDF document text
    • http://xn--b1afbmo0alc.xn--p1ai/ckfinder/userfiles/files/geremu.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/gidijabosizeban.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/fobomap.pdfIn PDF document text
    • http://asqcert.net/files/files/fezobumase.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/10156300844.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/62254219235.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/vesovodazanikukegurewur.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vaviwimofesawexurajanijo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161501706e1745---85248565030.pdfIn PDF document text
    • https://avela.md/userfiles/file/704295420.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/22448943523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=define+the+meaning+of+curriculumPDF 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_off0000b140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 16492 bytes
SHA-256: acf5ab96887fe5013c5c73f9407da2587c049a9c2225f39c9b0ddb76541b176e
font_02_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10716 bytes
SHA-256: 4798f54ff8504803ea95305f7d57e8dda5c2d71da828aba2b5ddc5c2ea049216