Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e590f77dc08c097…

MALICIOUS

PDF

80.2 KB Created: 2021-07-29 23:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04533221d8bb1fe226c277d70d3ba073 SHA-1: fd8e64a8612eb7f241c9f0a0cb811e05556c12c3 SHA-256: 5e590f77dc08c09758d208114ed1255848faa18e8fad2d4f8afb0de5f46d567c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF-specific heuristics related to URI and link farms strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=t+fal+grill+optigrill PDF link annotation
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xipug.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca3df6bbc5---nitosogavere.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162482336112113986457.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/35765134080.pdfIn PDF document text
    • https://cis.ncu.edu.tw/document/files/tivegumido.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/apvrrchacm2r87r092madddc6h/516261787.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/20199451977.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/4247501425.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cc8992a01fd1a62861b7b22bd3856532/66787613235.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9ho694c6ia92eaeuc0fhc9c643/zaxon.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f82695867---nuzasawekifakat.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/27075392912.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b00f20108---vigivadiwanik.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kggt895bu7sim5mjls255dbaa0/54165292305.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/d722aocu5c3j95sqlvn3s19mp2/2099938990.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/paferegaladuxasalavalo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/wasizaguxud.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/19220956491.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cjb6q3k16sbmno70p60hgc8v6/33229482874.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/2dbdadf020c3eebd99a5cffd7af4854f/45215859884.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5945d07913---vufilatewoxup.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/favevojek.pdfIn PDF document text
    • http://elitvorota.ru/f/file/88937038697.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/vaduwuzove.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ed251e286df---tusakunazaredonimibebez.pdfIn PDF document text
    • 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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16900 bytes
SHA-256: d39bb164ab4f51269b89aed64205c86bd0a96f8a7ee4e7f7b256d876c2163e54
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 10092 bytes
SHA-256: 6da46ea05e0e48c793043dd7439712406faf18f84c2d40516a08f3f7f4241a88

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