Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b9a5923581ec10…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 05:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a426027f8ec309d9b9ce972adc2a296 SHA-1: 47d5d2981a3d4bad2b5934f2e8db02eed58da185 SHA-256: 62b9a5923581ec10319d6f7d24e3360b339296346c4fe95b08fca51dfc6051f3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of compromised CMS upload links suggests a method for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=spin+the+wheel+spin+to+win+apk PDF link annotation
    • https://foulardfotografando.it/file/tojezipezatowexiged.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/79198854617.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/8510334064.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/nerifex.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xijafopuruxotagi.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64738764804.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/60425744027.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/xesibemanopiwaxurotovotov.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/vukotupoxetazaxu.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/53577935908.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/52794437559.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/it3gdemcdcphbqqa1n66lfj1lc/87789875112.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19ea2831100f3685b1846f344855b088/73661330703.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/671b64153d5074c1b3bec187606c303a/xeliwolagiwame.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tamepureranimizugigoturig.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/91636350738.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/9667628859.pdfIn PDF document text
    • https://iwistw.com/upload/files/25422400094.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/wurosugavu.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/46183462437.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/53885089149.pdfIn PDF document text
    • http://wdnederland.nl/file/felovakato.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0ae5b18ad4c18197f545e9538f375840/bipoda.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/naxonidi.pdfIn PDF document text
    • http://logicamail.it/draft/media/gukavelinufe.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_off0000b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 16472 bytes
SHA-256: cee0190aa5caa5860b50feceff9ebe9ba2becce5725001955603c19966e91849
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10500 bytes
SHA-256: 3656b2a817dbcb0dd455cf7020b0f49f1fca3d3180e4fa94ac919878548da8a4