Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b30ae475019a4c8…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 07:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc2e80591d855added6e0cfd10ff3054 SHA-1: 764dd586a8b7151f6f65e4aa2fae14d3dd7cef31 SHA-256: 7b30ae475019a4c83c86c4dab459212754142babbfa15d4b36f3e452c8d4f9ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://oniceh.ru/uplcv?utm_term=9th+class+maths+guide+pdf+sakshi+education PDF link annotation
    • http://chiengthai.com/file_media/file_image/file/jirapifalepanoliwanaga.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/72294707435.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/51979251112.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/57631813047.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3dba664b2eb0a4fd433a5ab274c55b88/72528252075.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8c9f9273b5288c9f9724c5d365f5833a/54622929000.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/najewarojujopewedubananu.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/90290559928.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/befozuxenobotisiforujo.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/58848327346.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/jefipidixagu.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/pujetenodonawavapile.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/dixonuderuw.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/didazetujenalugokikudadi.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/88450585248.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/beregafuxebilavotubogiket.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f3772769---motonawel.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aac246bb215---gazikoxizexotu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/14165531472.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e191ecee2b770096c1eb05fbdd5961d2/tuvabumilegiwowuwokim.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/lekakibolupe.pdfIn PDF document text
    • http://unsersohn.ch/images/file/47021656329.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/41b430d8ab7035c0196d252f57868085/92636918310.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/67306170844.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xuviwirazodokonenaxali.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_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 18480 bytes
SHA-256: 402f01148a48b21b8b11fae2484be3a72e171fde7addba538c23ffc317246bd7
font_02_sfnt_off00015e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E02 11232 bytes
SHA-256: 8d574ce2ef53d6add7125561e8fca97d6c00371de46f1ea7b5626e93628029b2

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