Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c056a9846ac417…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 21:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8f34e99d40e202c956d2a78799506ec SHA-1: fda8b24b4411b5e73813032ecba35181908dcda6 SHA-256: f1c056a9846ac417207f1c21729cd29bcce9571a61a40d465995c4f739afc5e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the ability to determine a more specific attack pattern or family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://petrduchek.com/files/71461161566.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/3035570172.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1ucps9cckd3g3urhf05hrq1l01/lanufenugesotanuxube.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/javololitiwaferazajemudik.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd8377d8bc---24248747180.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8v38eta40atlnjsu6tku801s43/92839702043.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a2c51d945---bibogalozigobifufexe.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/bufali.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6280d4dc44---xadugesefetoxipepafuroxa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c710d8f462---lapajuxupifidaninaxawomaj.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/47419781059.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747493a369e---vadokovubefadawoxano.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/78777665031.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/dhd2ucg3bqcliohjv4lk2qims6/vufexonuzepadiz.pdfIn PDF document text
    • https://norservis.com/files/files/24308483343.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/37331963989.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/65264830075.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/02f82bc35ce61cab1c64816837a833e2/81516554460.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lokubodefenusajisasizax.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/44826235980.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/60726664539.pdfIn PDF document text
    • https://il-gusto.com/images/file/46940648618.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/86675156651.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fimelujuparowinifufel.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5c420417eb67e70067486866413d9b3f/motoda.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9su1p02bt8vdcb5j2dqj24icj4/fovema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=smith+chart+graph+paper+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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10704 bytes
SHA-256: 2a0914aac9c6db3697e94ce7b8041c58ce14100d9dda5e6c226448ba4c9a1371
font_02_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 17112 bytes
SHA-256: b10aa29c008ba4b8f0fce5aea1987452675c9a3a5d578b1b9f34027188ec0656

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