Malicious PDF — malware analysis report

Static analysis result for SHA-256 866f74bb04dc6da1…

MALICIOUS

PDF

119.2 KB Created: 2021-09-05 17:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3957d1fb8b3981a78e8c8f038e7a2066 SHA-1: d1138f59e646c1000478ac2f36ef232d306881d4 SHA-256: 866f74bb04dc6da102338377a0f47aa0eda636e70d77e530f33a49ab6ee2cc77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The primary attack pattern involves exploiting user trust through a seemingly innocuous document to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bc715c25---81857653878.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfee7f350---59720460083.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9hj7ttk28o2j1f6o1l27hhbh0/86521689199.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/89478279561.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/48463533140.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/xozesojenarogu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/28436712624.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/pagetevisokojotal.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wurorokujanif.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/68736651564.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/weduso.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3070943e8---wazepubizigakobenuj.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/zepajunugel.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609741cc8b1fd---29932765622.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/dojenopubojogel.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1fb1a232---momuworiwitowimiju.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/91651011039.pdfIn PDF document text
    • http://dd-eng.com/files/files/gidumoriwuwugasab.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gemeb.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/48498701242.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c66c56468a733637a2100368e752fd6b/ramiwadu.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/50302601713.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/tuwusiramejodubexozadof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=otello+pdf+verdiPDF 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_off00016bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF3 10148 bytes
SHA-256: cc26850d598d50888d20bffc04016c4801efa7becffbb072c17bd53218e86c43
font_01_sfnt_off000182bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BB 21136 bytes
SHA-256: 09646a1707055e64eaf5552d4246af94b2726652acf2b4c655ee0d31c7f08b00
font_02_sfnt_off0001b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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