Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bccc074c3dfbbe…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 06:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf02453cfa4232efc2e73eddd2ca35e8 SHA-1: 8d0a1b6c006f3cf464ef075e8152abd6cd9fc494 SHA-256: d2bccc074c3dfbbe9dc9d0e5cbe746ad5ed06f2901689ceef1db4d4594dd5948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vnbg5093pfmc1jaefisv4gi7m7/tilukepefezib.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/11503002343.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/40195988886.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/35357133040.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/7720178115.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tusuriguresu.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/6418456098.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7372c1c50b603dc8e82d1f9769201b5d/21001074735.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/43962010609.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/65708449373.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/44327595648.pdfIn PDF document text
    • http://siembra.me/uploads/files/witup.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/32236593430.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/74403512133.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56400616524.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/42398122148.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e2225ec3fafb6e6f57e8a61412d97157/88870392669.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/lutetubanatof.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/86986925292.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/31546455919.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/17169413249.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/xemerekugumifab.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/edfa604eb0d84349aaa6fd2275a28b00/diguvo.pdfIn PDF document text
    • https://bachson.net/upload/file/mamakozotoki.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jowos.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/sedobox.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/52816828791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=complete+list+of+homonyms+with+meanings+pdfPDF 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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 15784 bytes
SHA-256: 4c879a4e8fef717815246de5c1e97427d5e25df8b00284e72076e00ad54c1da2
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 11076 bytes
SHA-256: ef4d5c4018b11ed7b0ee07e2c033184007caa373fdd83f092c8d89ef00015eba

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