Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe454182bca8003…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 07:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f25b9868c8f4149f1ba8e8d5f0481b4 SHA-1: 7f83955f015bde4bdbbc222009891b75c87057b1 SHA-256: dfe454182bca800375b08bb16ed74ed30bbce72d21972892aaea7c4d78a8406c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt at SEO manipulation or directing traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b2a3d6675e106b28fec09568add32915/65239068904.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/31a748157a2313da1003a3cb8f7f52b9/85654892142.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e3c512a4f441da7b28dc4033df7dc248/zosiwor.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sofukowusuzitalaxirul.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/likozunovoruzut.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f0d0f846fd416fb3269c4d6e3caf3b94/dukabijax.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e9294944cf4d586b40412057723c529f/ruwizibanedudapede.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d74d0d5b---93924199040.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877db0dd352---74051579226.pdfIn PDF document text
    • https://mmszke.hu/files/file/wubomefopexikululaxefowib.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1bd775e51bfe83806a86fa9d39c26d16/58328206903.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef1292de3---11825978272.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/doxezowofoxabuperux.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/4110198137.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/winavab.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/41763286606.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/82478917485.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bogezaxepogajebagut.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/83775648890.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/27584c95728036c60eb5c9a902c7369f/37112583955.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810236a9368---tapukujadutulotezuka.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/petokukofabiwuf.pdfIn PDF document text
    • http://schokofontaene.de/idata/disofisaxuwosujevumufi.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jekuzuvenewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=optoelectronics+pdf+bookPDF 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_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 18284 bytes
SHA-256: e36150fa2e2d342b2e10cd0be3039843d7bef8f3d3d5241dcfba89930f3d356a
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10708 bytes
SHA-256: 38b8ceec54081a32038442e06e75cb16205a103006255137597863ff5fe69fb4
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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