Malicious PDF — malware analysis report

Static analysis result for SHA-256 62061efafe4d8b6e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 09:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6476e2838283833166776527d8ea955 SHA-1: 6502b7cfa61a5bc0502ca57e390044eae2f5718c SHA-256: 62061efafe4d8b6e3b0ea180a50daa22d1aae54ed7ffefd9c5d1d60bfee73b5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content, further supporting the interpretation of it being a malicious artifact rather than a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=recover+voicemail+android PDF link annotation
    • https://www.vignolaweb.it/ckfinder/userfiles/files/xososaf.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/duxekijugajazawik.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/foferopi.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/90388014994.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/29740549700.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/71715779268.pdfIn PDF document text
    • http://glttek.com/userfiles/file/rupuwelo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/momidid.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416455e070a---38177973406.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/nedonujafasegokapiwi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4db1b017---2944884565.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/39151718406.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nezuposawoxexuwoso.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/40449452804.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/34395210778.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/begedojelufi.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuzegases.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138812e60ac1---monejugenogefujote.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/58953367314.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/7813320420.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/tomodofogugusamizum.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/33596555475.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/17223014337.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/63163291106.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/37976812618.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a8a1c407849fc4ee351f7c3225793359/52436767872.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kiniv.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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 17512 bytes
SHA-256: 133e4f564b880df8a017a21b380d6b041e2a68045a034253e4fd5b63b3460991
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 10376 bytes
SHA-256: 9316e1685b62c8790be642dab6c6ab48004301ff3257a935c3b9d0652b0d06b8
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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