Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b229b9db010ab9f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 01:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e78024180e0843f0ff085491138c809 SHA-1: 42dc9d1abe1bc49386fd38c1d637cdb69e75edfc SHA-256: 0b229b9db010ab9f1de7a42e9307c358eea0f2a58151b7a87a5fe8b161c17769
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the presence of numerous suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://erpsamik.com/ckfinder/userfiles/files/91933321945.pdf In PDF document text
    • https://iword.de/userfiles/file/16703181712.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/58064486086.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/40049990111.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5c6e469ffbae9e264d76752a3502e186/3536764828.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/kizegokirixamumatudumutid.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/palusixejekolago.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904145311.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/xopos.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/23401062201.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/tomekutinusujugasumolox.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/36126491477.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/77845946653.pdfIn PDF document text
    • http://schubert-hh.de/image/file/75165929693.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf6a83f3d4976bedab069f3e51f907ed/pobewurimologiwowot.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hgnjuu8imisq3d8ul7hlnikhn4/42518400705.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/dikuvepuki.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/sumigurivizebataxivofin.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/93535855024.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/gagazokovazas.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/99678933920.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/80696476727.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/68154182500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=720p+movie+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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17256 bytes
SHA-256: fa46d3e497e752f297a26bb1e3f7e5170bc06b343272c31c748f429e2e25256f
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 10536 bytes
SHA-256: 989b0feb5eeef34eb4331d9e4420b16886944cd5e8884ef6d46e0962917982fb

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