Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a9f2b81c19f229…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 14:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47427988e478160c3f2b8ab360762d32 SHA-1: 9be90237933ab3bc11456c5713c8996d06e051f8 SHA-256: 86a9f2b81c19f229915abdf8cb6673a3559b694ea0247e0dbefff62d5dc42331
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6967

Heuristics 5

  • 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
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/98e5f2deecfa9d043a325e8f6a085372/15057342573.pdf In PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/57770208738.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/4981948473.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/71637521693.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/gojinenemalugoloro.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/47619102440.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/18589029325.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fikonugurixofegapaxelorum.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/44640625936.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vebisatiraruweturugemexu.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/80619980322.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tidifezogalikizanuzusaw.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/16811487163.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed51ac74---momaworapiwiferavugufu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/14329517984.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5c9459c7861d8a310664faf4833717fb/wotujeduzojosijoxoforile.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/84563360322.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/36559823856.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3388c3200361994b1f5b76ae3cc1b78e/43664404180.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kipogorozinejabiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+ad+blocker+chrome+extensionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 11020 bytes
SHA-256: e836a4335b32a15838c372ef913512d6253a6f5038a3f37feab0f74ead31771a
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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