Malicious PDF — malware analysis report

Static analysis result for SHA-256 c963f39796465312…

MALICIOUS

PDF

102.2 KB Created: 2021-09-04 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58d0553920746344fc09daddf3758603 SHA-1: 0b933d90bd3b12e22c4ca370de3dc3a1e0f56f4d SHA-256: c963f3979646531216de6117c7a0760fc8e621f47b80b9e9b70918acc8dc8141
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards the document's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=equations+with+algebraic+fractions+pdf PDF link annotation
    • https://ngoctraithaibinhduong.com/uploads/news_file/bidulekul.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/luzenovoj.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/bixubezevabumarofaja.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/48675064994.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///suxusexokevepo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/11212365446.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/17603935865.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2b7d8187---30015859725.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/ronopowul.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/godifoxopiposuxeru.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/febewigokaj.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c6515f7e4f28e3142dd0fe104e2bc172/49514309017.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73669107926.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7d365625a7dfc7dcf65c2ecdafdd3675/gejamugeruduv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/282hn3qoo7ur1ptplfqu48tmrd/83931445190.pdfIn PDF document text
    • http://ned.ru/uploads/files/84186318514.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbefe34a88---kotanuzujazesuxobepozok.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/fbd5a879f70978469fa88b102cfc5455/48798496738.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/vilikatodedunamiligefe.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/25430fe360049b5a89901f704784d6ca/zisusiwapaz.pdfIn PDF document text
    • https://dintek.eu/uploads/file/totibasuzimowi.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/rujaruduviromidutipurele.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/55704854634.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/15869341948.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/vanogam.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kuraxipiputibogobakipo.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_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 11356 bytes
SHA-256: d8ce0c394c5ad2251ef5b927e91e482394f667a2bdb0d32671636aef08b4ddbd
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 19616 bytes
SHA-256: 5874d74119e804cfb6f2ab1bf5ca78ce152e03cbda2458f0d6a66aaf33cf3466

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