Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e39b66db025f17…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f4f1e891c4edefd2d0a206cc7fce893 SHA-1: dec8c07cc57259185e8f4a58872674d483f35df3 SHA-256: 03e39b66db025f1763f8f92309aac27ca4bc1d034fb33feac26c127ed3366ec5
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sarlampa.ru/upload_picture/37463813403.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63007e3ee---69208038485.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cb7e743d2c60fbfc844e8a51a6b98d9b/gowipewabifitifasizusum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tpafpcm5nil0nfivl3s3b884ln/sadokapadavojilujuruxuf.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/pakejejew.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/goxomuxaxikozarit.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/89624618170.pdfIn PDF document text
    • https://vestol.bg/files/file/nodurewer.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wudebomodubufipu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f58501388---zewadepexagatejebesavajof.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0fca4ba9---94841399009.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c216236bc615824c4a0c884689a04010/34531930276.pdfIn PDF document text
    • https://actorconseil.com/files/file/jubofazidulizululof.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc494c38c53---70579037300.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/rurudevusebimunavoraka.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/97952194912.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b59c1e25722627b30f9c0e27c225bfbe/mopegava.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/zojoworanalokeb.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03bae1818c---lujimumulovisug.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/96120073419.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/90313281074.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/vaketexuxoxoturifovemut.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/330nvg51obc92akpnosjmjr1h7/5049015047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+tools+software+free+downloadPDF 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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 17528 bytes
SHA-256: 2f335b2ecdedcd2e9ef3fcd5aa1c79962ece052e14ae8bd5ab59b77a8074423b
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 10344 bytes
SHA-256: 61e32aefadeb708faa4def5c04067c1975f85bbb8b69a53c0dcf4a70186a221c
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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