Malicious PDF — malware analysis report

Static analysis result for SHA-256 2949e285ae4946f5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 07:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33bfc4d95faeb7ff9177f33df527a477 SHA-1: 9772ca7bfa02b08d1c5fea25df8386165719d2ae SHA-256: 2949e285ae4946f515384d4f090cc81bffb36d2db83d69302930d65498d6d46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://elesi.eu/fichiers/files/99755020414.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/29059521148.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepu.pdf
    • http://purofirstli.com/userfiles/files/23314796234.pdf
    • https://portalbime.com/UploadedFiles/New/file/mibizovekizizipud.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.pdf
    • https://learningsolution.ca/userfiles/files/lezijatuxinorakevizovukan.pdf
    • https://igescanada.com/ckfinder/userfiles/files/90004263917.pdf
    • https://al-wesam.com/userfiles/files/vubinapufuwurisixevuxusow.pdf
    • https://bak.vn/upload/files/pobidenuvekedosif.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tilavaparukisipotobujik.pdf
    • http://aaronandanthony.com/userfiles/files/57930565138.pdf
    • http://solarissoft.com/img/userfiles/files/puropogonopuzizubifizabe.pdf
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/guromigesimisunuzifufi.pdf
    • http://westernstudioservice.com/admin/userfiles/file/dakipobatifirija.pdf
    • https://garnizone.com/userfiles/file/49436900321.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161405e102caaa---dejuzapamugil.pdf
    • https://sukienmiennam.com/userupload/files/98395325876.pdf
    • https://aneri12.eu/res/file/ronowe.pdf
    • http://emblem4home.com/UserFiles/Member/File/988321117.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb3824537---tetezaratunopurekonaguv.pdf
    • https://k31szmq42-nu28.com/contents/files/pajijujefinizotubenodofo.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/16482530725.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=prokaryotic+vs+eukaryotic+organisms
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16792 bytes
font_01_sfnt_off0000d682.bin
5e14606e71d762bb54a72d9063aa472da249cc5d22ad84a54c34fbde87cd9485
pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10900 bytes
font_02_sfnt_off0000efdb.bin
9d1a8c1112bdabdcd2be0fbb37c60bc825777574a7bcd05880fceb1181434268
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16644 bytes