Malicious PDF — malware analysis report

Static analysis result for SHA-256 417701cb5478f776…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06ec1ae746ebee5d9287d2e01a5cb7c3 SHA-1: dee0d017bb0eeffd6dc7f4ff2dc752b5a542b3b0 SHA-256: 417701cb5478f7763560e16e9c0053d66a08dac6a6cf16695fa0f34db08a5c6f
172 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features multiple link farms pointing to potentially compromised websites, suggesting an attempt to redirect users to phishing or malware download pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jeansresource.com/js/ckfinder/userfiles/files/wozokewebiwu.pdf In PDF document text
    • http://beccaro.it/userfiles/files/47785668981.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/63254783080.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/vuxipomizeripepukoj.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a45f625c9---11213253079.pdfIn PDF document text
    • http://nemalipics.com/75151545217.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/vebat.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k1goleflg22v0fqv4sq1vmvm1j/41434049400.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901191634.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/munoserifurunapurenez.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/48902785981.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/rixokabafeguxogikuvimo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/sogakopepumovowiboto.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/58648415464.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8oadn6p3tgeuvvt3lndois15vb/maxigokuniluniludibifes.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zuzuneb.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4efe3231---52959172181.pdfIn PDF document text
    • http://njchemland.com/upload/files/2582622399.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/56608511393.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/fozaluferesokak.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/retinamuf.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210902_ABF0A4A94E6AC593.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/67618788415.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/bepimovemujufuxowugaj.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/53540348708.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/betijesetuvalutirota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=yts+tamil+dubbed+full+movie+downloadPDF 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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10792 bytes
SHA-256: 87f18c581b66360e49c6ebcde935323a6180d2d7bb6a81a1317a00dfee6058bd
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 17724 bytes
SHA-256: 8c17e7e33eb90f2de9042b17c822fe6edfa52ecc7deef1cc954aaf596f65300f
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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