Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba131662c544787a…

MALICIOUS

PDF

152.9 KB Created: 2021-08-02 14:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93c99e4fedd921cf0ffac4ebea30a3d0 SHA-1: d7d4a3267a32fd7a6a8a6f41f308de7d45a64040 SHA-256: ba131662c544787a0ee3b7aac42d19b79f08c42ba82e16db69a395e5a0fbb396
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to potentially compromised websites, suggesting it's used to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071164590472---88083696988.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc952f37b7d43ea22d70fd1d94255353/pawabivare.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jal7u0jn42rphn715i5ntpe6t5/zutawufabuberemipemusi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f37a23491---lonudu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6972a2a4b---50765691674.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f0b1e7f6---zapinosibamafugam.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3d196ad7599cf45c3cb33ee56f539c11/roxudowa.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b085dd924---38187361029.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ommp93eacmmskchncgusode9k8/83644859259.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/kedadaruk.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997242cdd---xabemin.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d82354cdb---94321870096.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/lexanu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fa19efe7---kolupipakosafufitap.pdfIn PDF document text
    • https://tmtteks.com/files/tagagusivewirabere.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dalonimobokaxib.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/futazexufabalelo.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/fusaxexipujef.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/80b0e34689373045d6fff926231126bb/87307705561.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf436a552fb---leran.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021072809025773499.pdfIn PDF document text
    • http://industrialdevices.in/uploads/68534996533.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af17ecf394c---76326884828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=burger+king+malaysia+menu+pdf+2021PDF 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_off0001ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC7D 11276 bytes
SHA-256: c4c65dd33a3b59a52e0325b61bc96e3dba59f604c88eed48e1c3ab39c3226e13
font_01_sfnt_off000206d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206D3 20044 bytes
SHA-256: f00beb51f710ec54242b737b4fc3b21926104638573170372b5db1124c06b5ce
font_02_sfnt_off00023c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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