Malicious PDF — malware analysis report

Static analysis result for SHA-256 6effc5b29f4e7ef7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 14:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e10105562e17f6b1e6efa402f0d9228d SHA-1: d411df58d82e30456932b4b546b54198dacc1b0c SHA-256: 6effc5b29f4e7ef7f582e173411b96e4579945fe5cdef31b63823465c769ab8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://sunpower.lv/ckfinder/userfiles/files/rozekarajimet.pdf In PDF document text
    • https://dbmotorbrokers.com/userfiles/file/42670470526.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/21955182038.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83a0309e2---26881894886.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/tenusupunusu.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/zisotaferubikatitixaxu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/xozus.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nao9jrhuuge6nbbcvl9972u5hk/9529550031.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/lalajulavunimefebava.pdfIn PDF document text
    • http://vce34.ru/attachments/file/95888107038.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tisividanolem.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/ponudanonexujisisoreriwoz.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vetexajodokumuzajogobo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d8e86dc3---14888991850.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/27101720173.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/xonoxogapinisakusexidawu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jepoj.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/keloguragimuradafevoluz.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/tagakitugisemopokarod.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/23210062563.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/74945787448.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/33656919667.pdfIn PDF document text
    • https://rajaunited.com/contents/files/70284881290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=voice+memo+android+phonePDF 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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 17620 bytes
SHA-256: 9682439ecc0cb1246c62fc455b0032de9310ac95babd8ad55dfd3d85126dab84
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 10436 bytes
SHA-256: 3cb466644601a6099687cf56779812865e15d8932706d8914dfa75a0e0fc1190

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