Malicious PDF — malware analysis report

Static analysis result for SHA-256 baeca1a6b12475e8…

MALICIOUS

PDF

94.5 KB Created: 2021-08-18 23:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 538f00701773bea15878f5da5558e8f8 SHA-1: 8423d52d79b9d13fd568c5579407c02b51e3d2b4 SHA-256: baeca1a6b12475e8079bac24c6483ea2d943ea6985a682ad98d0bca4d5d75a18
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external URIs and compromised host links points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/unuukrofson09jcmc15jbiunk4/95764210005.pdf In PDF document text
    • http://koszyczarek.pl/userfiles/file/sojixawemorevuda.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/47719582835.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc897dacb3---23479732892.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a0b8ea28f83896c4072697bc5d3bde29/nukuvirowav.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/pabizogalizekeros.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ae459b8bf099170e566b772b4f3c969a/xifizenulezasunevadiwu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kujixuzujuxuzaf.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767057cc999---gorixevaf.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/36754578893.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/disokozukezagifeki.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/947af9fb51527d039dfa3ef4998ce9b3/lutigipig.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/negukixudev.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6556c7161df1a4f06f8a78ae52c8660c/jowagaluwujojim.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/36009996986.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb5851057d---vazosefosove.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/xivazatunozumivasol.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ih6tc5k91c5hf03vhfluq9c8h4/7951218819.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zawomes.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tekewubomabusanubef.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/zajekuvuviganodezubil.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lixazedatebutuwitime.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/jilufajuloxix.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/sopozaxegilusivonejavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=balancing+chemical+equations+worksheet+2+answersPDF 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_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 11272 bytes
SHA-256: a816e4f31c4b666e5677cff9f623c53d596ac7f21a9f73d1753e1cc3f5985d48
font_01_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 17480 bytes
SHA-256: 367768420eecbe724923eea0bec311e3229a8faacafbeaffd61e3512ac804f35

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