Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72c0e33dff95c1e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 15:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ae733c30d9dd7fb15f9ea0117d2e764 SHA-1: 3723404842809f9011d0ddeb07b85e31365b9618 SHA-256: a72c0e33dff95c1ecf29776a6929bcb52c9281c168ebdbb75094a2c34a70fe63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=mobileuncle+mtk+apk PDF link annotation
    • http://sky1981.com/asset/uploads/files/bojijuguko.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343d9841540---68562692584.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/33218310324.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/8809739033.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/69965170719.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/lelikaxaro.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/wadawunapi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/sezasagiwowuparatopaxipop.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d3e028635082e79c4a0a1e0d08b66f31/88037884836.pdfIn PDF document text
    • https://grancom.by/upload/docs/rojuxaxapojolekej.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jutejibusudefinenozoguni.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909183316054.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/i47si5tqcqallsdo5reerpr2ah/badarefutujuv.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juroxuji.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/52863026012.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84366105735.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202199133427256.pdfIn PDF document text
    • https://preciseenergygroup.com/media/muwolararafetivi.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/bofeliwulod.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4cc0lro9glv5kmpv4ftms9dn4c/61834093296.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/93354082336.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d0e9009285324f3d85b316db0c23a804/28505083556.pdfIn PDF document text
    • http://master-br.ru/img/file/bujaferiwugo.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10592 bytes
SHA-256: 8d75fb2d91316dea0d34c9c949e1c97fa0c67cfb9d8d3869e4c38b1af99f7623
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 18264 bytes
SHA-256: cc130ead7dded7144890a1318274e514c0b4a9151cf561446c643a89dcbd32d3
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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