Malicious PDF — malware analysis report

Static analysis result for SHA-256 27191b8885315ce7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 00:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e517505e006721ddb5c52da239d859f7 SHA-1: ad13f616b380b6c3457a16412ff0ff4b1f4ebcdb SHA-256: 27191b8885315ce7ee1b35de5c0cc5967ea45b12fa7054906e843be9c4d33f0a
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 compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webmakler.org/userfiles/file/jabugedisi.pdf In PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/68231504237.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/45456463303.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/wofezugozewatatowimetomu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6d35cf87---meletitukuleketirafalu.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/55516907136.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/81895027605.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/sosajokakazokagin.pdfIn PDF document text
    • http://goref.ru/files/file/zowobudomazizumozunifovem.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/sosutubuku.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a807a0f0---mawaraseb.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wusipekobow.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/veter.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/66797405648.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eacc7c50d---refalib.pdfIn PDF document text
    • https://durimawar.com/contents/files/dufivofumanopotavebirufi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/26539782154.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tusulavazetoxawijapogasi.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/monuzegesifenizibomabifux.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/20923085811.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/dopizutijiragebunimoxav.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/giwesa.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/33801964806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aplikasi+penghemat+ram+android+tanpa+rootPDF 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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 17960 bytes
SHA-256: 30d5f4dea2c0800c5135ee15d40a35a6a15f8b48ddedf01cb0134851c9437d55
font_02_sfnt_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 10912 bytes
SHA-256: eeda1e16d591b25df99346f26435c9864ea08a66c0876898e551cdc0d3c474df

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