Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdef0d512af2279…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 08:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b83c9064f2331e4defd6d40ff4642ba3 SHA-1: 4488239eec83e8e462d3ccc72b0dffbbb8807e6a SHA-256: 7bdef0d512af227998da010d2f240f93620ee1972e87b8c358e0b4d5b01e711f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be phishing or directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+pc+game+download PDF link annotation
    • http://platcometals.com/images/file/giridemugepofujepodep.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130f646d395a---jaxerojanabagesitimexat.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/19805363528.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/21828935515.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rudud.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/fifetipinuxitomegofutuk.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/gigetonozuf.pdfIn PDF document text
    • http://clerus.hu/files/file/zitubasu.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jurokifomabebufate.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/vomofepezesosepu.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/gakotazo.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/82746691553.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/womepuditajotugiwidot.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210911_015554.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/74053349977.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sobopapugogawewuboli.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/18b957c4694fab9618ca480b0a35f0ae/86719082453.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/gimofovewigadapuvoma.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/vewomunikunaw.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/68292abf565d1d96df918b487fcabc66/dofavazukefazegumitu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sq26fkvedq1v63548baaf7g960/28786501403.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/vifukuxigolomobepoja.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/37595289584.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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 11096 bytes
SHA-256: 4f75d97e1d673a5a4a2621c5fb4a68056974ed8dda620c57a0d94af2c3555693
font_02_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16084 bytes
SHA-256: 43c1ac7341b0c525d60984bf1d8d6410282deac3d10d7d63e2df87a9acfde5eb

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