Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bef845dec258cd…

MALICIOUS

PDF

98.2 KB Created: 2021-09-05 02:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70aab8cdf115faf60bf2e1e272d9ddb7 SHA-1: c0ac6cdf02136d9ff157672dc710cd886c614a87 SHA-256: 93bef845dec258cd659e3bc429a79ffdf4a89f7155c223a6f17bc5a15a94dbc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's used to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8e3e190e06e4a4a4756022382403d5fa/38871402299.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/vabowowuninex.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210719013327.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/67792529857.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/69142910662.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6951400e359956df81ee2c22da6fc147/71962205410.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9afa4968---pozig.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b4222917566c02e682b89b71b2efb999/noxotevolotuw.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/25991821237.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e7b61acbce22685c3592569fa461c516/48706813126.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1b3dd22f1143c566fd1acfdc93a84cac/lupazite.pdfIn PDF document text
    • http://hanifeugur.com/image/files/gowumo.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kulujonelona.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/43135215725.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/17911470969.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t9mflhtmj4lrejril42ij0vkhp/13836572340.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c700a2a0f4d---18767740435.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d15b4290e---96704412304.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/27835081315.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/75384017800.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/660d3ef46938ee66e0e32dda9409e157/posolalisexupol.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/07/file/zubaser.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/9tcsu7n5be9snvddhg1hlp2b66/15051187643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=polaridad+molecular+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_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 10512 bytes
SHA-256: ffef7384b0061e5e7d9695c66438b28d813165713897d839ab51e493be1865c5
font_02_sfnt_off0001470e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470E 19720 bytes
SHA-256: ead9b39df83941ba494f1fd9dfce26dea9e1b42608483d9e3cd030ad634d8b2b