Malicious PDF — malware analysis report

Static analysis result for SHA-256 91df7b262d1d8cff…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 06:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 835f8bbda208ffac1ebb85b1da84f5d8 SHA-1: 5ae119d7c7eb900451d4631331e379f81f488b36 SHA-256: 91df7b262d1d8cffe45cdd988f6d78ec63750e27148e34ba9fea6219adc69f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rubenoferro.com/userfiles/file/31068617768.pdf In PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravuvaliviwexadiwav.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/91166188978.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1920d706---87205093111.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dui49mpsqitg0hcbof85ve2497/73835810364.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd11f2ef3---82565965310.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_21966EC5FCD2E429.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/811b7df00792ef716181b6dac30abdf8/97433340065.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e9135541---pabume.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bfb6abcefeadab94c97fb254e6849d03/sofufoxar.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/wufawirutazeri.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a0b3befbd8026768b04c4fbf698988e6/detejaselar.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/wiwerog.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/13148962427.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109010134066541.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/13663171943.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/31978050472.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/29898171925.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jubipagerofuminewi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090722121945.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/71842231578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jumanji+welcome+to+the+jungle+full+moviePDF 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 10888 bytes
SHA-256: d6e678616d8561dc15ec03100da9f18d2d5841791730f365378c835a33764577
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 16992 bytes
SHA-256: c6dde4e55e27af4b754e013860faa2b612e083f3a1466ac2aaccb6ee4636e4b7
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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