Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b59d66e310f85e8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 22:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec88f7191d9b34e76d4bb000ee874785 SHA-1: 6c9307a067aa725c9c10996f65d035d41a9faff7 SHA-256: 2b59d66e310f85e89f0a63e8c98f6338106ab3a0bc4c662e09e2e92b2aa04259
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=how+to+backup+android+before+switching+phones PDF link annotation
    • https://indiantalentjunction.com/milan/media/gamorirefilefew.pdfIn PDF document text
    • https://defi128.com/userfiles/files/92830728370.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/74088736117.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/maberibezemorupeviwuzex.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/fuvutepasaxazoz.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/49791489632.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10956bff84d96f6f2155134eba2e7001/90602842335.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/misenozigotujujogux.pdfIn PDF document text
    • https://glozor.com/userfiles/file/48307064670.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/koguxufojoxajakufemarira.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/78536150591.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/80787398445.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/51237951442.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/riboxaxododozonafer.pdfIn PDF document text
    • http://centrons.com/uploaded/file/10855419696139eb64e66ee.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/62873143959.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/31737934448.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/78724487180.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dozisivez.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bavetidepukaxobejaputul.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/81648266005.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94268de97---ritawomojomapovotal.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1omvssp63h8dg7ff791b0jggqu/niromoma.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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 17584 bytes
SHA-256: 76d6f24c51f0076d8f97e4ed07e8f5de1486e664c67a122ae95c6f8750199e75
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11260 bytes
SHA-256: 90e552805245911f20d180da709464ae9cf73d6ad8e37ca3818220e12c4c34bb