Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0a4c19892bc80b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 10:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f79572266d7f107ed60f8c969b1c0316 SHA-1: 677433f3bc9f9738089b96e1d6c09f251b561a0b SHA-256: 9d0a4c19892bc80b253ed813b843b653b0d715bfeae7f15ed01312b584f63449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=hostage+negotiator+game+rules+pdf PDF link annotation
    • http://urjabatteries.in/userfiles/file/80640254411.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/563451921609480b42cf85.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc31809b---10036997049.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eb0920055---10768664167.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/38754605105.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/vepalimote.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/7556893168.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/29607163450.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4f7c87746e0f676022075f5a923d0c8e/72558347164.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/37423631834.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vezunanikobeximoliv.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/30829736486.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///21102775530.pdfIn PDF document text
    • http://ipceurope.com/assets/file/roleka.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/eca2fffce2fbf85b617e0f7917ecadba/dudikixivodotul.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/97459503484.pdfIn PDF document text
    • https://wildnaturetravel.com/File/zamopifedisivuluj.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30961903000.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5724cbd07f---4826448187.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mtm6bj7gn1fg4q95jcdn1cg5j3/zarepolipoxebagaja.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102bfc8a02b8---gezidem.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/fidif.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/rififumisubifog.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vibubowoxifolegaxagejoso.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_off0000c3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 17732 bytes
SHA-256: 9b2866c735f60679bc9a5f6ae176ea2187d3b4752b3f36aceaa8d4360f587a1e
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10932 bytes
SHA-256: 805000491f917cf75a246d4a2d3881c44b0656664b294f9077f32f8eeebf7f35

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