Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cac30faf5a624a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 07:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d13a1497a846fc5cc5af5403502d6f9f SHA-1: 6871d521373f55beb7b12be07b1bc8bc79c5d9ae SHA-256: f0cac30faf5a624a29f174a29c2ab41f70b3668bbfb53962b98aaf31a6158de0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded content indicate it's likely used as a lure to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=ufc+ppsspp+free+download PDF link annotation
    • https://facades-et-traditions.com/actualites/file/41534973815.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/20126794416.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c30342f6c2---72051565577.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_144709.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kuzaxesuketesedigisebakab.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/38209500657.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2057712f---84628450841.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sefatupusidasuxodapemu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ed76d10f1f1c82b2760b35596814432/sixitisumapifox.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/80825464326.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/dugafilufisufetuzax.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/sefusiw.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/5515345676.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/xufomajat.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/65005698709.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/73098941848.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/37926824293.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/vegorulajusiwob.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/51604082783.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/funokowunizeradumemowa.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/25595204369.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/divugikoxasusafomixaruvep.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1d17b022---53240384053.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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 10516 bytes
SHA-256: 2d1be9de778469aa70c2bea760c36d65589acd36a2b02bed299330c4ded5db13
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 17660 bytes
SHA-256: bd020724f5b41850fd24dec064952d88a6492b0e4b3c6e24b19604a854ea6bfd
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1