Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5aff082ddc1bfc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f5ab75cd58d5bfadad2a0b530676ed5 SHA-1: 5821e182a1d23c562dcc2f1b3c44d54e31fd12f2 SHA-256: 6b5aff082ddc1bfc8fc1c708b3eb3d049105a92ab7f10dcdab8381d995c48c2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alarcon-v.com/editor_upload_image/file/55671323047.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df80758610---muxav.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/52492610023.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/jiliwodukepuzananojigenos.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/10567538815.pdfIn PDF document text
    • http://denledmpe.com/upload/files/78976747944.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/54364500345.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9941bc39f900188a340aa09c89b6e709/92742817655.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/4387620300.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/rusakokasokewos.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/27790465285.pdfIn PDF document text
    • https://marosme.ro/hirek/file/nonowolad.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7e0ee2d56ef5a310150215e9797c0ca3/pawuluxopuli.pdfIn PDF document text
    • http://built.lu/userfiles/files/29785936693.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/883de780bbb4554773149ec8fb694f8b/zopusedenaxazovegowig.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/63032918890.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/60785879097.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9d8d638d21a1d448ea5c086493503deb/bidorumarajipixepedil.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pavufufoj.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/6836ebb905aa9dbc2b0774dc57cf393a/97270263857.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/wugamerameninudu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fepitosavuleb.pdfIn PDF document text
    • https://aedwea.com/upload/foto/dolexaselipagozot.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/93691332762.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l22sjh32mg16u3i99lk42unsg4/vefupokasofokobemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bordereau+d%27envoi+exemple+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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 18952 bytes
SHA-256: 3acb4739dbe4b219c65c5d33a904b7378b9e7be8216643fe8a539cb1c8c28c54
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10748 bytes
SHA-256: 141f913afb36581608cf081693f39a62a0fc0165cea08397d7a45010b8dd4b90
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1