Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d72b97c67b080dd…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 23:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe339fb6bcc874deb4d6bd896d1fe761 SHA-1: 48f7ccf4d2dd146fa300dc6cea342c8d0d99a6b5 SHA-256: 1d72b97c67b080dd928a1b3a751008e0fb306812af857e8a1fd7646d007ffe0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, with URLs like 'https://chcial.ru/uplcv?utm_term=run+3+hacked' being prime examples of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=run+3+hacked PDF link annotation
    • http://stilistspb.online/public/files/uploads/files/zuvuzetumed.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nejizij.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/1754261505.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/nuzogefixemuzutiginuxebem.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/rupasakekiv.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316f60ca0ba---murezifejiwagotumu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/4397614565.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf05358b9---fazinitipese.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/70931369478.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/6805928732.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mivun.pdfIn PDF document text
    • http://www.bash.cl/media/file/wukejexetibapesoti.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/41262422808.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/61952188408.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905150600.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/df37b67ec4566eeafb53df909ea87153/7779558817.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/figamipomigabot.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16133481472945---52213814893.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/80092539489.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/32032940076.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kegiwomumunaduneponigan.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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 10252 bytes
SHA-256: 2546a516f92f9dc07c15872af7c7f1a5fb56a9660f9b78b604159fe872ac01c9
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 17416 bytes
SHA-256: d01b7e35f729b3e13bd317567aed3920217049eba86c603b1abfff8b83a3b50c
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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