Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d254e9c03c50d44…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 19:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 717829eabdab0f2d4e2704327800fb4b SHA-1: b29cae03bd811fceb1254004002764dd3fd38d1d SHA-256: 6d254e9c03c50d44f367aa9c8b25d019fdb8464f364d1109f1b54cb477926bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://www.koreayokogawa.com/ckfinder/userfiles/files/38879322003.pdf In PDF document text
    • http://zagazzo.com/userfiles/file/69539316974.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6d7f34ea---70139859527.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/88745188187.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nosojelatowamufisanojijor.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/86804478175.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/sagadewabir.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpamdpal97564katqc4avv7mo3/mabaxagetozapur.pdfIn PDF document text
    • https://senhewood.com/d/files/5572142231.pdfIn PDF document text
    • http://splogservice.ru/content/file/66989072952.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/labofuwiju.pdfIn PDF document text
    • https://yorapp.it/file/bawifaduguzifivezimu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/af2a92e4iomjarus248u9gmgtf/rovawomedef.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/mapowuzowejut.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/50186209772.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b715d48b082---40605254123.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/jutojokijomexolivag.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/nawawiramategagufoboxudaw.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/xevirif.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/83683195518.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/19670803300.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/dirudadakiku.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/63366315622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ielts+vocabulary+learn+400+essential+words+for+ielts+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17228 bytes
SHA-256: 4af40eff9b02deccada723c6e1733779cfda8eb5088b5698fd933839f5736c69
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 11268 bytes
SHA-256: 55d4b2995d58fccc884a36eadb84fcdd9a3a36a8e229d995e9c93b33363f4970

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