Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735941a2dc30a19…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 02:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c52482a3b8361d9660958978f8947495 SHA-1: 8e322135e97fca1cc49cf58931704ba4e4a3af78 SHA-256: 0735941a2dc30a196605abb447707b17d23eb3e3e9c298013aa197e26302ac39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gipabatovof.pdf In PDF document text
    • http://96rangjai.com/userfiles/file/15721379587.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mokuraguzolavejeg.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/26783769198.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/40206451315.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/betipapepemegome.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ruritikemalakizoxukelu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/mazegox.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/wuxotuzilewiw.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/59990392131.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/5639671437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0ce49b845---27301291653.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/11927298151.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/30964708833.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbbfb6fec---28364018638.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/79635454644.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/ralidimawotimun.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/74606330162.pdfIn PDF document text
    • https://vleek.com/uploads/files/naduw.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/vekalefoxasemixoromof.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/14026430784.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219242298234.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/9343902245.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52444673676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=turn+on+pc+with+android+phonePDF 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_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10548 bytes
SHA-256: 3015461b96abc8801fee9100a5c0eb6c29cce791daa849e35c55f688d79e9379
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 17700 bytes
SHA-256: bc704ab19ffce7a9356aacf83a2e8a6120d1543b2584d52e248717bf8bf3ca21
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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