Malicious PDF — malware analysis report

Static analysis result for SHA-256 963db6c2f7f5c533…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 12:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e7a2605c68421a20e6a5aec8fc90afc SHA-1: 63b82c7a911f310cde08769226bf9c36c20fc5b4 SHA-256: 963db6c2f7f5c533cac40b6eecd99bc457fec969c0cf1f53e3e59a3392ed0b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.gc-antey.ru/ckfinder/userfiles/files/38860278290.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912093331.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/25486288789.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/vexugeruvunid.pdfIn PDF document text
    • http://aven.su/userfiles/file/fokejokizutagikuruf.pdfIn PDF document text
    • http://chenruichem.com/upload/files/lofimojanugulirenu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/4892964027.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/tojagipomoxolojataku.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401695ac75d---97879603739.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fikamos.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/96065143046.pdfIn PDF document text
    • https://airbays.com/userfiles/file/98298664583.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zajetibugekenusetutekajar.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/37485152738.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/53281427735.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/88146001962.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/40167824165.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136017c72494---45643437434.pdfIn PDF document text
    • http://snft.ro/media/file/moludizupejogif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130765cb52a9---71485219943.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kebikeberabunude.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lazamijomuwilodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=negative+words+that+start+with+kPDF 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 16848 bytes
SHA-256: 807854a5decab1119bc4189c5d0ac6f77d3bfbaf96fe5585c529ecd75fa3a4aa
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10600 bytes
SHA-256: 52c47502a988a1d870b6449488d9ceef131cabff49eb32862e191daecdf9285c