Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc55b8b851a19cb…

MALICIOUS

PDF

99.4 KB Created: 2021-07-16 15:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a71572cd1e84e881bf6e4fc7c06a9e3 SHA-1: 463a162cbe2a7c1e28b7cbec8e09097d68586ea1 SHA-256: 4cc55b8b851a19cbf0ab89c3ab48c45e7e1b96751a48dab01b8e23e82916083c
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site. The ClamAV detection and ML classifier strongly indicate malicious intent, with the embedded URLs serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166bbb8de9---mivubimedaridofibasunux.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hs590abutmkpksja0fs0usuhcg/rusokegokagopuxoxapofap.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af60da3ce13---72656208403.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98a2a586c---lejusunogagig.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pitolewileximomaru.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/56322167611.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/sulikopulikusivonowupo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b588ed5b1d---gusolopugezerukagusupuju.pdfPDF link annotation
    • https://baohohoanglong.com/userfiles/file/logewaro.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c7b576e5---fosawelovumov.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f190e7ea2b---5122075827.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/detalaguzereve.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9a3c94ab---19753361347.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/51591685642.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zavotigofuponusebetex.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/99507706334.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e730601a729717e834ea6c17c6c5261e/bezesipegofijivu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3a32dde486e14445a0d8b96d25e7e68d/wazunenolumijijewuv.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522235559.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/17072031261.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kazotobudol.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/durhj9vg8tp4to7g03t3ledao3/pinoviwudebalax.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e2ea4fe293c2e60a452837e1edb0bf9a/xupudixineda.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089881e968d0---3372444723.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/80642122746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sketch+the+character+of+shylockPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 16356 bytes
SHA-256: 1d40128c53c5cc5cc3baf82d1fd0d659fb40e8e236f826ab71f7c826d02df929
font_01_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 17696 bytes
SHA-256: 955c9ba33bb3276ef2cf314fa065be1c42a6d9c8aa2e2ffbe68fe920bdc26ad0
font_02_sfnt_off00014de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FA 10516 bytes
SHA-256: 0bb2ea909ae49359cad05b41bf18a4636406d46780392efa91d14bc7c2e1d6f1

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