Malicious PDF — malware analysis report

Static analysis result for SHA-256 23124f49c3ac1da4…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 00:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bf079a3a042ab7b25520c71eeba99a5 SHA-1: 72ec56d0585c8380cb48367eae45c5f3a64c1f12 SHA-256: 23124f49c3ac1da4b0017ddb8faf2a11a2a20a57f55fe59abd7ec21fe7532716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hakkabrothers.com/userfiles/file///17864767124.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/8415106257.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/bikekukas.pdfIn PDF document text
    • http://parentini.it/userfiles/files/xewuxu.pdfIn PDF document text
    • https://birotex.rs/images/files/momivakutujogaja.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfac7c7a5e---jemumumoze.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/nakeruwunotibowez.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/rinufatexalaj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094368236ecb---67342378097.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/bekijet.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/62877230860.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/83680675347.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160796ccaf120a---57464420185.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/37654144374.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a4f642a34c0711441e20da107c6ed000/poxewolidowemuze.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8s3it3vhfvhk24i4q66464blqf/xijizumubunurezalekukedaw.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/siminuxebigodidatefozevel.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/86120878413.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/renaxugisezojepabum.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/mibuwizopoputulutuwa.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/56303884287.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f83798e9---pijazedus.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8b96a3eed19aa2b96522c443fb4c7f93/66374138528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=laughter+and+healthPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 17080 bytes
SHA-256: 18e7d75d0c574af330758bc51e2f8d4291d91347113e6b73e051088e1368a6d5
font_02_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 10204 bytes
SHA-256: 422759b194b5c26610c21736373f51783e71a7cb4683539970c3cbac616c8b3b

Open this report in the interactive analyzer, or submit your own file for analysis.