Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef1413691a8be5b…

MALICIOUS

PDF

82.9 KB Created: 2021-08-06 16:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0dff7d0cbfbe8c33773c0a3ada36a4c2 SHA-1: 612e2a408f39b71c8ba6a7b1e9f6d25ebce08d29 SHA-256: 5ef1413691a8be5b14ef40b9ff6271ca7cd40e1c2ea1721c14f04860d77dc064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=sades+spirit+wolf+7.1+driver+download PDF link annotation
    • https://x-software.cz/data/file/demife.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add6ba544c3---navigadozapebilut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88240aa360---zebejasu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/taxafilenarebo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4f3b08c4---bidurudobosuju.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d1d5ushv0oj32hslp4rsj1msce/fawoxiwewofetadubirawel.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/juguze.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24336aa41---xajumofewe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091bc5d21dac---sodepunoliza.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tirezefiw.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kinaninuka.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/080f1712c1d688a75bfc07c3acfd74ae/jobodavumivatatiweda.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/16221287815.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021717553146694.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/lodaxidoror.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/nizidozenanapufej.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2c19235f62381b29b1129df5f15dc8ee/rozemi.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/56914426593.pdfIn PDF document text
    • https://rosycaffe.com/file/4056486659.pdfIn PDF document text
    • https://tavio.ru/files/file/saxominotexaxozurivibibe.pdfIn PDF document text
    • http://ibb-online.ru/f/file/45595329485.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/21255388122.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f73728dad---pebekarenulunitakuxubeja.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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 18268 bytes
SHA-256: 799a67f401545e908eb0d9283c2761c275698693fefa8273c089a1f51004c85e
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 10888 bytes
SHA-256: e4917a9b1658daf76943a5df98b713292ccb29db72d3e7ef7ac2b834a63a7e8a

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