Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc73a10af1d43b3…

MALICIOUS

PDF

86.6 KB Created: 2021-08-16 06:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12e179d32b51ae554f714f1ca029bd6a SHA-1: 5fd89e34b0d672aea09241c761f3faeafb47a8af SHA-256: 4fc73a10af1d43b32ae8d282516a1e33b676e9af272b4ed8a57f886ad7185b1a
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute code, likely to download a second-stage payload or redirect the user to a phishing site. The link farm and invoice lure heuristics indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0987262d9300a35cab5016d84ea27cef/66094570937.pdf In PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zixari.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uadmgehtmkcdeeae7tvgiqu1ib/6798560100.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b19d4d16---59277471999.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/melosof.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/76821530782.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/gekudowebulune.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/4346519724.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/selekawup.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/89204579994.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/sd0vgkaue6arbj7hq3rfskg8bq/bupebolupolifikikiza.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501095938310819.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/19424280508.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/14003550549.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/filasikewunuxoxumesu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/35762168049.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2937595b887da9fc1c4eb495af4ddab/46845184493.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14bea67498---52805126452.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0997c312a---56737918688.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/57886331633.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/013cc68bb072c6b8dcd27af0d091aff5/14468246383.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/tosugubobugisowi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lebemidek.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437c16a13a---sivowonosomuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+stretch+a+meniscus+tear+diagnosedPDF 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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16524 bytes
SHA-256: b47e95f4a4ba5cac06e8f9a3b8a44a1f03272caf6de0605d42299ff2dd2b6670
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 11060 bytes
SHA-256: b6e5cd60435e10cfcc257e4cdae4ef454dd8a92ef1f9b3c766f6d4ddde7969b2

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