Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7b942284c09489…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 09:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6412dff5baa48e83f8752699fab6fe8 SHA-1: b572931e0ff6eb745450e076b159e5ea3580feee SHA-256: 7e7b942284c09489d8ee4d854af6e9a9195264243e77112a633241b76e2a051d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms on compromised CMS uploads points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://molenat-energies.fr/molenat.com/images/editor/file/vojanowinixepo.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/4039068431.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/lijonitu.pdfIn PDF document text
    • https://kede.org/userfiles/file/88080150835.pdfIn PDF document text
    • http://labsshop.com/d/files/38274224163.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/zugexidegatowanefufata.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/tekisezogo.pdfIn PDF document text
    • http://armanetti.com/images/43595932121.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rizezuburi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/boxolutudetomuso.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/41129838198.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qgl5r22h0ff1qtt795ao1ktvvv/31480599544.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/42162604337.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/38672667535.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/26489956826.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161350952efac4---tuparipap.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2e19pqrcdrvehoar3gonqn9kb6/35730318117.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612FBFF5D8668.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/52559935992.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31767780984.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesixufo.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/79483840940.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/fakomezejoteferumegugo.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/11134518846.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/16434037583.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91933321945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blink+the+power+of+thinking+without+thinking+by+malcolm+gladwell+pdfPDF link annotation
    • 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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 11484 bytes
SHA-256: a1a69cf37825aa50ce28509a3109314aa9a84b7b91fa01c2064dd62ef7544481
font_01_sfnt_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 16360 bytes
SHA-256: cf0c3e533bcfbcc280069b25489207e0a140df4910bc5a9680da67c7db0efe6e
font_02_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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