Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ceedaff6a2a903…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 13:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 127248b9c6792e78ca3248147dbe6def SHA-1: a832fd12596b2d8e3b4884938c5c0303dbc80daa SHA-256: 42ceedaff6a2a903b5d38e2325e0b5c31f0329eb4aa34d649181ba6c793126ff
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alburigiott.it/userfiles/files/31828725697.pdf In PDF document text
    • https://detectiveoffice.net/userfiles/file/xulajumavajefowozofaximuz.pdfIn PDF document text
    • https://alutat.com/data/file/muxuw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/j9cg2d8pb91om92ppt6kagi0f1/38508187526.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/kukuzitirone.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xokiluxesapi.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/pemoxolopuvelobukopiliva.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5faf025c9d---pixoropuzafonojavet.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/vukabokurev.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/79195040740.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/gadev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/12esnlscfjsa4jm292skmke0o5/26656376396.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210829_675B0A337951387E.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/29525399175.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/87600424040b75c8f371262c781903ec/riforerumikejajixi.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/godupitipanijepiwuw.pdfIn PDF document text
    • https://schmitz.cz/res/file/dotuka.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98f5e3cae0---96878212350.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jufiwepatumajotekujat.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/76813153729.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903040920.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/tesemiketibebu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c7cc54eafefdbcd7d60c5887b33d7b73/99359844266.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf54c8cb0---rabomewivakef.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/waveponipiguxosexirer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manualidades+botellas+decoradas+a+manoPDF 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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10764 bytes
SHA-256: e55ab0f6e15684e6863e3d394a1a9d422de3ff2b6fe34c8a7b7d872c2a30f60a
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 17300 bytes
SHA-256: 13c6ab9d404c4ffd2b960801872155fb48606d42781a2d1d6cda736d526db21b

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