Malicious PDF — malware analysis report

Static analysis result for SHA-256 4090ee42f8ecefd3…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 18:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df7801fdcc60a22c810676bb5dfab796 SHA-1: 542f7ccba3196c6bd87bc2692000ca024fd58fec SHA-256: 4090ee42f8ecefd3f07f384eae608daba1f0c9a505ad5d37c9cb0058fa2b00b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zekidilektekstil.com/images_upload/files/62090422603.pdf In PDF document text
    • https://szallas-karpatalja.com/upload/340964061.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/23954644611.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/77155629615.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c9aefea---sififotevekumasuvomenezon.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jabojuzazasojigiz.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/17789738555.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/liwazali.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/29881764311.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/64582198276.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161389db91996e---87987974087.pdfIn PDF document text
    • http://webursitet.org/Files/file/gijobokuwi.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/81972782270.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/kemavezivilamawika.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jovemex.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/neabv4cco2528i4b6rdu9pg9qq/25989533730.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/40894024702.pdfIn PDF document text
    • http://napiarsaigh.com/images/guwapodagamaweluxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=canadian+business+and+the+law+7th+edition+pdf+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_off0000a9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A8 15716 bytes
SHA-256: 63ee2d6dcda55c2b6f69759db989daba976d66855c0d1e2e78ada4cb6e846941
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 11004 bytes
SHA-256: 6925f3ab910e226c02771384ce2514ff37b8e98ae42c4fb203680ad4f894b056

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