Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caf48b8d9d106c7…

MALICIOUS

PDF

103.8 KB Created: 2021-09-04 03:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5211892fc1703a2b1f4d9859b434ed8f SHA-1: 2da262ed3a727ec830d71d2adb8ebe97655d916d SHA-256: 6caf48b8d9d106c74c3c006ef7975713451710dedda53f4a34f63175675eb3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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://krisoc.ru/uplcv?utm_term=telecharger+tarif+douanier+2019+algerie+pdf PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8f03ee83---88651844054.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/13021094871.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/03/file/20210603_034448_106.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84953821457.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/jobibewa.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/nitilezojuzodekotometok.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2da11243a63c63f9b59cf75867a72220/zuzoz.pdfIn PDF document text
    • http://myqself.com/upload/files/bizozoroxu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/48058557179.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e984d4c0---vapet.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/muduj.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/juwukitikefopijepodaras.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/19827231160.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3b02ffb8---fadajoxorisenako.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/4608974263.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/38842911247.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6d8b7dd5---pikuxamuvonezenolir.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cd0d07b68c35984c701494b1fc955d38/xituwudumosirimuv.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504065428_1540881180.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/24162757157.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/logemesopolabagena.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xadefejukubimabodikosexu.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/5330295641.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/legetubaromo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kt86k4jfnibp3n2dun0hdt2926/bugekosebagodom.pdfIn PDF document text
    • 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_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D9 20988 bytes
SHA-256: 71fff5276d1a05a3038d914de81085a369a4b4c8bda712c4a07d0aca88a1f6be
font_02_sfnt_off000176b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B3 11256 bytes
SHA-256: 9a12acce0e81404c48eb5a6aa83b34b1cafea0587b2ba453159d0cf366095743

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