Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc15a22818c8d72b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 13:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1a75117182249e4f565f3958d8537a7 SHA-1: 7298a942be4c9f7f89bd0665b77546add1c46440 SHA-256: cc15a22818c8d72ba4670557a60ddf77cd7c847f29f15f2b02aeea9732ea09d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the final destination by using multiple layers of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://abwingscolley.com/uploads/files/52590217127.pdf In PDF document text
    • http://harnettcountyhba.com/userfiles/file/tudanewomotufakowuzezab.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607beab98c5e2---jisozobagoregojafa.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/25321737953.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7037d79647---sidipinanig.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/segevixav.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/372f5361a50b52e25823a1f6962c3931/dorabavemenupe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f2406cdf55d1ac9651b69db5ae681f68/pamutazanobonalotox.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/wuvusimur.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/xobawubexunolosugebog.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/lotoxupexiti.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/nalixepiwatitavowefekuj.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mepunitogubawiz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607802688eac8---31568965743.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/guxorafoxutamamuxonixerem.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbe243ae6---fikevitowadekamefo.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/15499744941.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zevoduxudakawazit.pdfIn PDF document text
    • http://htwy.com/upload/file/sazofuwerovi.pdfIn PDF document text
    • https://roc.mn/uploads/files/gematoxedaki.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ca288316---xudopolimizoxokulonogetol.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/35434021649.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/53908953517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pool+of+radiance+attack+on+myth+drannor+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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 17620 bytes
SHA-256: 2e17310fe5553da2b2bb188d8af7196d41119665e8558d91fbec518a871da0c9
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10924 bytes
SHA-256: f85153888aeeddeee29b60e685ee4a605f5d9a2225b590de2e90942ee3abcba0
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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