Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe317236e48d67…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 17:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfbb48bcd32ecbd12ae2e69da12ab606 SHA-1: d08102b34d0cc87f00fd068e12f4600d7a62a015 SHA-256: 28fe317236e48d67af51f9b98f27ba50cad0822dca0eebe9987d4d661db76f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://theorientgarden.iorderfoods.com/uploads/files/33504363260.pdf In PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/buvugixutogikajodaz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eac35dc630d7da2c813bfc2237d367b0/8157025644.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/13913767108.pdfIn PDF document text
    • http://artediapharma.com/upload/files/togad.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/rejolulajixan.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/78900267601.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/piwesibojor.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/97278477469.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/15387216486.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3c463c256de22f245924f6683a1c1651/gexix.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/xitokosakoninomab.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/28406607927.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/josidenegasewenexuxal.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/70088292743.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/kusojeluwajiwo.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/newukopafirawatebagutaxuk.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/12059183041.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/35eb5dff443b2344dc210aa337392683/76166718313.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/45182636464.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/buwepinufazigazofimi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9390259b6---xiwejinekedawewarigomomed.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/gaxamodadegax.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9c0f2a1f3ac0e3e3df78566d13a00158/94807462051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2nd+line+app+for+whatsappPDF 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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 10704 bytes
SHA-256: a3dfbd2f114ff9dda13585ff65964276fcd566ca84f671db79a8f271ed98e4e9
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 16324 bytes
SHA-256: d6cea382a92c073bf191d9b05dabe3b3e26f27b06ab6336796b09321564096db

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