Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a371d28fcfc3d3…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 05:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57fb277e11eb806970d0cc9973579792 SHA-1: d508e260eb0bc312bc627311f6b52f043f22f32e SHA-256: 25a371d28fcfc3d35186b034e2b5f4b6638946f1a613dd9f6d82f6cd81d0b083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=hd+streamz+3.3+apk
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16147d0ef94106---93432996435.pdf
    • http://majortaylorride.info/images/uploaded/file/govuguxeni.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/bedak.pdf
    • http://nuestratierrapremios.com/campannas/file/mirorizozonerivajifulus.pdf
    • http://saiprogetti.net/userfiles/files/62843461135.pdf
    • http://lexen.ca/userfiles/files/51879536624.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0nfjp1bckomjnmh750ch8gbbv5/87826975703.pdf
    • https://hospvetcentral.pt/site/upload/file/68576006058.pdf
    • http://smeeing.com/userfiles/files/budumapefisotororesusawu.pdf
    • http://metrominicabs.com/survey/userfiles/files/xaxagolenofo.pdf
    • https://shevtsov-art.com/uploads/files/numoxawutepitikalegot.pdf
    • http://ucg-eg.com/userfiles/file/zazukixixixadig.pdf
    • http://lejuriste.ru/files/file/dupogoguduxajigigimunum.pdf
    • https://tannhatviet.vn/upload/files/28191740318.pdf
    • http://giaodantanthaison.com/Images_upload/files/modugekagoxafasezu.pdf
    • http://janaturismointegrato.com/uploads/file/62685944180.pdf
    • http://savytrading.com/userfiles/file/21106385166.pdf
    • https://ganganagardentist.com/userfiles/file/29829576710.pdf
    • http://purofirstli.net/userfiles/file/vutil.pdf
    • https://erdemlerkoleji.com/resimler/files/mapinizixaten.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5aa42665e---575331641.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 16792 bytes
font_01_sfnt_off0000c7d3.bin
05908c540243a5adeb87cfc0402f909a4fda81da2b7eac3367ade1d1d7858ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 16428 bytes
font_02_sfnt_off0000f10d.bin
197dcfb00ce872eb61d3610da9b421cefcce64b83c4af4ccd4bb8d6d5bba2fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 10572 bytes

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