Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf5384bc572c94c…

MALICIOUS

PDF

111.7 KB Created: 2021-07-02 20:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3423759b5cd722ac03d8ffdad6b3323c SHA-1: b9f47c7459ae42ca2f08d9862596f041fbc54a6e SHA-256: 4cf5384bc572c94c469523a4913fb39f828376646c9bb86c0929856515dbe004
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 CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://fullhousetourism.com/UploadFiles/file/20210605025711144.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b360378f---7023635833.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/faribokixeseni.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083077938a2e---jatorasej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e3177d0b---71756264177.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbad8b2cf7b---10218570085.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/pifederikasudaxexavofoga.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/benujelerusejafofikus.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480186a6cb---21802383094.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jikisusonojofoxud.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/83451508716.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c8b352cd3708accdfd6412eda7cffe2d/21222576049.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce169fd6d---1130792885.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fe32533b09caf66217d17509f1eb535d/59651762755.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/9476671713.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1be65158e015417249f8a34c63be8d7f/lawunoduvodivinu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/44367708957.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3k1rhrto53mm9e2htfehi56ld/zekafuravomabisi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nrj62kkhbh2f9nh85kde1dquc3/39085390972.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec02a8ff5---88508250791.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o8a74un5tnheo4grnp0sbkumhu/zadesisekikefaduborebanog.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/jodadedelutojizunusiniraz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ltl4ej6iaa0qst01bjveoh1jp9/bazemibefopipe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/473cda8c323f97c75b4d19ce8296cde9/47062333298.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce10e3e173---lederolebelirazol.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097a91f3627d---95890578830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+keep+guy+interested+over+textPDF 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

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_off00013ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 10908 bytes
SHA-256: 9613983beec59001d185a0ab2d1f83d6a432c404e24f79fa9e8e8fc1e81dd413
font_01_sfnt_off00015416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15416 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00016a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1D 17256 bytes
SHA-256: 81722c81de1555d2fee5a756556257a8e25928c8d3d496df1c3cae5c684323ee
font_03_sfnt_off00019705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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