Malicious PDF — malware analysis report

Static analysis result for SHA-256 645439eb044f2ba1…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 05:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2425f5e2c07cb0a2489bf6b60881df11 SHA-1: a46d9ec4b44d3342bb5827d5ea562d06d9b1dba4 SHA-256: 645439eb044f2ba1a30bec8b0c1e412aad9e5540158e971d762ac88918a0b89d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate the PDF acts as a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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.
  • 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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/uk2q3483fqers2i3tu7bq0nn1a/31650074591.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fp346e79bf3lg99fl95lad1o1j/ginararevezexef.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b644414d537b5f617e3cc892d0cde185/lepoluvepupu.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba60945afaf678129476dbf21d5fb78d/20543800403.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096816e3da5f---pimizokaxatusobavajog.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ebb0dba6cb6bf320673dd70fa240adb7/nefiwexisetisonugenejeda.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6edf23ea2d---84924095187.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210629205323.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/63ca03cf9629aaae24affd2352446d2d/69876248530.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wutefujepokob.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85f3548d2ff47754dfc7d30c97ef19df/pokudufuganuwavodadajaf.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b226ce1bd286a7350335b5911d463c94/30800176723.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kabnq50cvdte7a50vs4vqaukr3/2446016175.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/76602236220.pdfIn PDF document text
    • http://sun-eko.eu/files/file/wonub.pdfIn PDF document text
    • http://webbuilders.com/files/file/wexuduxafamodobevu.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/senagob.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26ac472fa---tepowubudasozubobofavesi.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210623_070905.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54de95b52---guzadanavud.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/938de1a9bc33cc0d975faf5178a8420d/witab.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/af102ad82a7e64517c1efe8879b3ffd0/98088843293.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p83npk3pn21gl3cprvdcpc5cnq/lovitujuw.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/af2f67b4c812040a91f935b72a531489/pukerupenalolinewexupo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/19/fisukimukefivepokus.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/mevurotarupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=icd+9+code+for+right+shoulder+painPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 16556 bytes
SHA-256: 5265aee6e10706f452277712f42462777e95bd142f20316b5c2423df0ff23683
font_01_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 11120 bytes
SHA-256: a928dd089331ba6daf00206835f506866cc1fa004c0d842e9c928b0b44b14990
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.