Malicious PDF — malware analysis report

Static analysis result for SHA-256 4328cdf32b46bf70…

MALICIOUS

PDF

95.3 KB Created: 2021-08-24 00:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 711969ef0311726058f4d07e7d24dace SHA-1: 46cfa855230ad156474d5a96e30a37ddf21b66c7 SHA-256: 4328cdf32b46bf70112fb47066a57072c50438a1359c5400e84c560a50d6db7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution point for phishing or further malware, aligning with the characteristics of a malicious document delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://palestraarkadia.it/userfiles/files/bedaretaxamobagol.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4fae3f8d40fd94225b83c545c9a955da/48708794207.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c55e88b1d---biminikeg.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc85ad225---99053904321.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1610069684d194---99724490330.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/lerukesupedezilibixi.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/96145923614.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ddc19de3---nilurapevenoxonatolar.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/74149096316.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/77266f9524c67e799e1a9ae0b53937df/ketijogefab.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c27338c2f56---70403681654.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/16951302696.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/gelatinulosumilixavilom.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/wuwomokamuvorif.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a2f341d91facd38364c2078dacd31942/zafon.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0a5358de---80906899234.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/91141351975.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/49306116703.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/20892583424.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nenotabasejolowijirakikef.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/5014498260.pdfIn PDF document text
    • http://afro-safari.com/upload/files/xuzazewaso.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0865e438---40627910553.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/42937151609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boarding+house+for+dogsPDF 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_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 10640 bytes
SHA-256: dbf6ce94be9df716a63b248368140a9df7d23be9e1f125d5dd9a047e8c2a244e
font_01_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16580 bytes
SHA-256: 7b76ad9815c3b03e4937fc3f5e980d7660359a09fc44b82ba3a5ac98910e2733
font_02_sfnt_off00015558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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