Malicious PDF — malware analysis report

Static analysis result for SHA-256 4670559f752c12f4…

MALICIOUS

PDF

87.1 KB Created: 2021-07-10 08:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 72dff2e61ef8743f8d1080a1d00639df SHA-1: 0e97e96b8053708908e4ca0e9ddd9d52f47a2f8a SHA-256: 4670559f752c12f407cc079d6406a79a2869312ff9200e06a5de6c62a2ba86ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to facilitate the download of further malicious content. The presence of external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure-based attack pattern designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=free+download+aptitude+questions+and+answers PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd550bb68b4---40831925911.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e12cb6a86a1---sovakitoguxabixi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/52ralkaaiuus49ncfbs4rqndtf/tufisobivuz.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16208384791694571827.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xenavewozadude.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/bapufu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/42187463655.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/sowedagawe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0123bbb2---gexifunepubuvuveneb.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/344f9488e4bd8a78634e142a55cfdcbb/63278078187.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/af0f6f38d741239c7265608c4acd4625/fizavenidebetetefa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a1e11a7a1---65630223567.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/22595413539.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/61822370729.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/eqpf6sl415f3nhb5dsrhrnqo00/lolisinedijakesorodupaxid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910c5702b68---lamulidu.pdfIn PDF document text
    • https://0900107678.com/upload/file/nadovenuxonujeziwofub.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/zilizugugufovutigofejovig.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c916dba3f---84424122042.pdfIn PDF document text
    • http://africareview.in/userfiles/file/bazifoxituxixet.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2b6a1e0e---dekukexoxexunegasal.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/patidawisapokuratosakaza.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 2300 bytes
SHA-256: 172d44174fa1522df24bde3dd2b6d30bd49bfd49f32bdae55cff760e9223b46d
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 10692 bytes
SHA-256: 4bd03f30d5fe30a567d089eddd375571e46e7235b304fdae1521dcc91f6df310
font_03_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 18820 bytes
SHA-256: a54463c86aa41414882c479a73d9ec084acc554e004262470a6b58174e3c020f

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