Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4c3d4b0de12f40…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 05:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2260d652834196f2e9ab00c1067a28ee SHA-1: 947968cc9763d1ae0fb299c4ead08139c153c19a SHA-256: 1f4c3d4b0de12f40297ec85af922cde00497ce6dadbc7541bbfc48ca2ba369cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads 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 malware distribution. The presence of a "utm_term" parameter in one URL suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=technical+masterminds+gta+5+download PDF link annotation
    • http://www.psyforyou.nl/upload/fckeditor/file/vebawulevujolamabozele.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/5070813072.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/sexaz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f266068e7c---10144519141.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/25101387877.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/32030134091.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909231406399820.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/fizila.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/nikokopilavenolusid.pdfIn PDF document text
    • https://areicon.com/images/file/28099293418.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/vadalesif.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/xojanat.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b7ce20d92dcd19dedc5ac9c03b7f7f70/17378769602.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317f2e6c2f8---95455201954.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/biluxadorajaveterasafo.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/tiwobor.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wipaj.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/76242775984.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/24647489105.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/23080586763.pdfIn PDF document text
    • http://cx-gl.hu/images/files/zuboz.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/13370333353.pdfIn PDF document text
    • http://taxfreepoint.com/file/63584359534.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914094505_839615.pdfIn PDF document text
    • http://cobmedia.hu/include/pabutiralanudepox.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/96380501594.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 11000 bytes
SHA-256: 477a2a5725c7a48cafec7dab99fc4420ca6ee61cb080144cf7cf2a1acb85f508
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 20260 bytes
SHA-256: 35ada8c8f17fa26b9c7f0bba0319b9e97911c06da6e67cb02b2507b7bf044c26