Malicious PDF — malware analysis report

Static analysis result for SHA-256 db42360e1b77fe78…

MALICIOUS

PDF

81.2 KB Created: 2021-07-09 05:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95bf2a54e223bfbb9804a2093dcb3ee9 SHA-1: 42c95bc674db675282f2ba36a408482789967d93 SHA-256: db42360e1b77fe78af4e0919c97b45cbfdb51fcdb351c5db8c693c2beed00fc1
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://fotinepmuveszeti.hu/kovagoors/uploads/files/25301976247.pdf In PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9fb35eb79f6a2d22683d3ac71f5cd922/koputen.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c7d976f4a92de237cb631e7d9305bb0a/67279855583.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e68b3d597f577fa758184c95a4cb2520/37333858982.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/80fdf3f78e1930158a42d9031bbc7481/57205794377.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337b4e49fe---kojugoraf.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fukelowa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a125efa8ae6---77122510259.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s1scoblnspsilmkucugqc6kp05/71428244876.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a6aefb65---fujepazabesu.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/49937398196.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073989310309---73488786445.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ad27e2a316e0688d38b56a834187670b/vapamepaxaxagat.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zigefarujikavunevamog.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/26003251198.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/vijolefanowojekuzefi.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/68069319383.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6babda57a2---87685556310.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/42494026755.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/mdp89jn44cr7nc9rm1gqabktvj/vapotukijupu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bcee226b9554e9de5c4ef9be090ac97f/37598018114.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jadeforunabezuloxerad.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/48770325650.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/sipawid.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sikuraditodafe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8e23acc1ff53fa0972ed897154d9cd5/sewibedixufixuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=java+for+everyone+late+objects+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 17144 bytes
SHA-256: 216f738fb48a854783739a0b568027bf8a76c2cc0cb493638108a11a7a0f75d9
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 1728 bytes
SHA-256: cb9dc774c1b66f1e8dc68f3683bd4b4d25f922d8a94fd1cb907a7d55e4c6366a
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10960 bytes
SHA-256: 000977af54de834b7e8781eafb09ca7005b6f0f1b73433509d8de663b0f33507

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