Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53140966f7c3752…

MALICIOUS

PDF

95.6 KB Created: 2021-06-30 22:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 26b00131dfc1f4498f031ea7c70697f5 SHA-1: 16f25dd16b4a778460e36435f20e4e4c3c8751df SHA-256: a53140966f7c3752d4fb92653aabad03da8d889ab96b9bb64acd25ad19e31c41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3adc032754b01943c03996d49bec4060/12092740902.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e70fd36d9eddf8b4ff51da0c433fc0a9/54175488043.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/638c516e2305d377ba7d975eca89b27c/40786654907.pdfIn PDF document text
    • http://centromp.it/userfiles/files/33253997115.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/debitexutaxalinu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160726d1578bfc---52321335163.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/275497418911624931650.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/mulivevowalafisawadowe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b56a1177499aab1eb004949f2b134281/8139904803.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93d5734b4---jurebozuvamizegenukiz.pdfIn PDF document text
    • https://adikkedua.com/contents//files/61112365097.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/mobuzikibexinekiwixiwisi.pdfIn PDF document text
    • http://dges.in/userfiles/file/bovulatuguzabo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/16550328927.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jisoxosi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc2676b625---97608324427.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/72536096171.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f7ba268cb9e26acb025fcacf52e5bd57/53473857716.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bazozukovatat.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/34600360813.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/q6jh6v322qpbdf8ka42bb0nfa6/43826535124.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/8768668233.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608544c31991d---85527856613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=playwright+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 18740 bytes
SHA-256: f246854824564786fc213a1c5f27e9ba726059090f1faae0a199b9ebba4c59d6
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 2584 bytes
SHA-256: 4b3303ed11eff90f9b055e2708e774682c7629dd267191ad9031b010430dc579
font_02_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10636 bytes
SHA-256: 378405f3bf457cc454641cee6b1301bccbdc3daea9e9666962fe1069fc4bc7f6
font_03_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2A 26756 bytes
SHA-256: 640e99ad8cd62085402651d7129afa5e95dfc32cc86fb174e90c860adab753c2

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