Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e2d5e6777ec91a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c60857e6be1535e5b10f209e57f8bad5 SHA-1: c8b1f3f1a6bd5b01ab69495f83704b560c563aa3 SHA-256: 20e2d5e6777ec91ade50ae2a19668cadbfc0a548de36aeec36b62f5b5ee6e0d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the links suggest a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=install+android+apps+without+google+play PDF link annotation
    • http://mvpbuilding.com/userfiles/file/29256566777.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1106630ce---ketuzusijeviw.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/76266228729.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/21973088882.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/40518050024.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/paritezojufigerivorenasuv.pdfIn PDF document text
    • https://ijp2.com/contents/files/jiwazurukaxi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5jeml9fsqe7m7vao4vbf5o5ro4/18893724988.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/sojot.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kasano.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87b2a6c77---xizigibixuso.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/24509749406.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34366753261.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe7ec4144---luluvomutupe.pdfIn PDF document text
    • http://indexone.ru/upload/file/54900163448.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/66163696179.pdfIn PDF document text
    • https://anjingliar.com/contents/files/35321049919.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/bibidazesivazopafowet.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/teguvuteri.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/47935328113.pdfIn PDF document text
    • https://nistd.in/userfiles/file/nuxasosibogederutumuji.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/75789155243.pdfIn PDF document text
    • 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 10920 bytes
SHA-256: 6fe31a3851d10a00d67fad3644e473975fa10c7dc0ffd3d984b467ffab815e20
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 18288 bytes
SHA-256: f971b3ccadaa32918a91020fd26b99f89e987fa6b717d5d560be29a6ab168150
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1