Malicious PDF — malware analysis report

Static analysis result for SHA-256 2608c2a3b9853c56…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 07:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d6e7e64ef9caf10d7d9c8263fcf86aa SHA-1: 34d374616f03c96f077f7fa391646bc2238ed14c SHA-256: 2608c2a3b9853c5699bf79256f669d437cdecf190b62f5e4437da571b24f74de
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, primarily serve to redirect users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iu0317l730vb470nmlb2pfk4a7/gaxil.pdf In PDF document text
    • http://ytlcases.com/userfiles/file/69834317608.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/213480a90d8a6cecbfe920e98b2a3f96/28293072139.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/defesime.pdfIn PDF document text
    • http://anpharma.net/upload/files/ligekuzulefixitos.pdfIn PDF document text
    • https://alpinashop.bg/files/21213178963.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf81e71aac---vajojoreridavumu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/44732871124.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/614afa2558189138680cb94a796fef8d/xaxezukaduxujito.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/16c0d1306165b283b6df326a5e3f787a/1965849030.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1a5f240104484ac886256a19f855092a/13382540352.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/24509963727.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16207930714161.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/14d845ce3439c9252da99a1d53715c60/doguvudew.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/xatevapuxazugu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/42608590845.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/85015526749.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/97766070245.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/98158346469.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a52dd49be7d---xufufizubevopofezabetebox.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e762e0998---xokiroroli.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210726113820_dGVtaXJhc2V2aWJl.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r43o8vfnqj0ie3g08dncg1scic/95578435919.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/21603530680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jurnal+uji+viskositas+gel+pdfPDF 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_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16764 bytes
SHA-256: fbe515a7137063e0d3d7cbc0f8bd7516cc80e97f102df6e72a1613514c1512ec
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 11052 bytes
SHA-256: b032027ea8947e749598bfec2348dd17d5bdc97cf61e55131491e7d8bbfe15d2