Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45c8da75390fb53…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 23:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ab80d2e25fb537e0e2c5e63c42689fd SHA-1: 9c68512227f51d519405192649749e932f22ba6d SHA-256: b45c8da75390fb53ba7bd7a9fe7f249ef66d9268230b6b02764249371df7c1a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01bb25cb1313730b250acbcd5c37ac80/fexofupefo.pdf In PDF document text
    • http://classicalgardenfountains.com/uplds/file/sukexiwusa.pdfIn PDF document text
    • https://italvaping.com/file/36811432942.pdfIn PDF document text
    • http://www.emailposte.com/pictures/xonum.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe010ad9e2---62253486376.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34247982c---jesefiwavikasowumewa.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ace782d708a---9352953984.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ig029pq63h0uthps6d7oeub82m/nanetamaduboli.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lokajawivamipusuf.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/niniso.pdfIn PDF document text
    • https://blugarden.eu/file/40043413413.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/30418769082.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/78338628210.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/37089258013.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/71546200952.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4375f271e25335d9d9264fc8ccd0f8b7/86636009700.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/1830865971.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/14c2933fa7370530f2a343757d3574fd/sojuwexarojaduvowog.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b5c93f5faa23e6f4113f06e893d46e5a/35976316823.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/kubaugaelag778s2nee7e1fd7q/jagato.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/82816341483.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764099b720d---73661896869.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13e8929af6---lavogejawakirabipam.pdfIn PDF document text
    • http://skncn.com/u/files/dobimukabebodopurobugoj.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d1106ab---torazaposumadanarawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=left+eye+started+twitchingPDF 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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 17032 bytes
SHA-256: 7d360cd33a247c20d388cf9f66a1fb96204836fc3f3b93556401ef78fc9e6fc0
font_01_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 10744 bytes
SHA-256: 3be33ed544204b6436ba17c3ae021eb5030f8d6429177a15c8ac3d28354ef146

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