Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0904c2ccb11387e…

MALICIOUS

PDF

93.7 KB Created: 2021-09-04 21:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39b4af8c3cdb0183df07730c7cc2b952 SHA-1: 1d691f1da590efb983559b3b2c81956ab4bdb4a5 SHA-256: c0904c2ccb11387ed987881dd26474132d28b03fe839940a342759739d51b8b7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such links for malicious purposes, likely to distribute phishing content or malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://haenuri.net/ckupload/files/getewilepivojivoxewifem.pdf In PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/909f6a6bc0fa657405690371d9a8d8df/46945946474.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/dinepuxulet.pdfIn PDF document text
    • http://pronobile.de/catalog/file/leposafarum.pdfIn PDF document text
    • https://mbbs.hr/files/87099680551.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pigupulugijuzotewonuju.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/vikegagakulipuraponejesi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382cfe9a5a---bupawobomul.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/12246909471.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c735e230805---lenebebezisorisewotidim.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/bakirasefesofatetodo.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/93672845364.pdfIn PDF document text
    • https://msiutilities.net/documents/kovidupajud.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/71122095458.pdfIn PDF document text
    • http://bdnchem.com/upload/files/wamasiduvapunaxukonezovov.pdfIn PDF document text
    • http://groupkaishan.com/d/files/86560430557.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/20358083087.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5de1c00597491463425f7b99fa486103/gevigedomizarulofaker.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2736ea299---jidomasutenanu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/81028931126.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/22060174223.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/7600055643.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fda13eejrrts1v00vq3a1h10d4/kifomavasin.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6fb7ee82b76490e71d0845ecf11106f3/30008113973.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/35788083611.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfac050834---27443717810.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rurituwekarelokadomewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=subramanya+swamy+names+in+telugu+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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 11236 bytes
SHA-256: 1703e5bcf7ee0cd544f259ae1ba49c6f14783052573f905fb04117ad342c611b
font_01_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 22612 bytes
SHA-256: 3b68c5d5d592df62f7b14e5da2883819554a1c7185dcd39dfa6a152082522516

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