Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c626f8e3008ef9…

MALICIOUS

PDF

89.5 KB Created: 2021-07-02 14:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e08cfe877e165393716f5443bbbd96fb SHA-1: 133918e8fe43d22361190e7f234acefa16ef84f0 SHA-256: a1c626f8e3008ef91ce1ce8958cfce86d7044ba17e219b1192418e0bc333be1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcj5rbfnorbhkko1s0b0inq4s3/nomalirev.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/9d35b17c27e105e380bdf8dbafeb3817/89804410994.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37aeab2ae6---15498624599.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879d49c433---mojolomuwafiviwogusiv.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/jujugegumudekil.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/28893231067.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab169b6fd8---65728330026.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271929349137.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513052353148297.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/11284421802.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jumasexewimopajabafe.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77234739135.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/renusi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/taranikelatifapevunu.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/83938769592.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd0202c9f---99120882011.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/jojeburubododovixezige.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080dab5a892d---tibomifo.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/49616215656.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3843623136099bba8d9f51.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca8c40131410c4f9abc9096ef4e46dff/36484995366.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aea4326c7---zebukowureveloxewoxavifu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/32ee9688b60b85cd7f5f80c66929de6b/ligisazaponetiwasonuze.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/29966465198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=suturing+is+suffixPDF 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_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 17124 bytes
SHA-256: abbcd0397d4361f0662e59ba17e33163bfb0c2927fbce7dd99c6c8755a5b8f33
font_01_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 10208 bytes
SHA-256: d29877cd6eff586ad0b4a8686fbe96092b202dca062f2c60342c089d0b45e6b3
font_02_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1