Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a99dbdd452b3db…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 23:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 346a673fadde88a69ef76599036ed44e SHA-1: c8193e1bb2f2400f98a6cde9541bde469ad52f90 SHA-256: b9a99dbdd452b3db7906ec801ddd4aabcd51011660b0bfe812069db8149f3cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

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 http://duonglaohanoi.com/userfiles/file/vinifo.pdf In PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/vapudabagobiwoz.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/43357855768.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/33549666180.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/tagofuxer.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/53041503683.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/97428692417.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17211520251.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jovob.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/80778377422.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/58pid4hnsvdfpfei123dh17q6l/simisesudedabitoxobitil.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/kazimawewawezopasile.pdfIn PDF document text
    • https://teamcode.net/upload/files/bodejuz.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/616810565.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/90097856138.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/fufokesoxokotanisakeju.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/nigobutuvegirofowuki.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/70133655423.pdfIn PDF document text
    • http://altus.pl/userfiles/file/58556092624.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/xexotowonutema.pdfIn PDF document text
    • https://betsin.org/userfiles/files/raxov.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/52650423218.pdfIn PDF document text
    • http://ge-mak.com/files/82842797077.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2kulkqehrd68o0vvhsqfck0bum/26341329628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=romantic+short+stories+pdfPDF 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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 10884 bytes
SHA-256: 3dc5c00275bb8b14a8a48db97f6685f49a9067a8e70c7c44a1170297f213e0df
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 17872 bytes
SHA-256: 01794fb23f8226d9f9fb0532660735503fd88198a0771fb208853d7c7c9bf268
font_02_sfnt_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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