Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a6ed4e158957b5…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 14:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29a794062fc7d9434b07c347ae589b93 SHA-1: 4f0f73cd3c6c6e3ac38c48b0962193b59a653205 SHA-256: 60a6ed4e158957b5e8af2993733f1908c8c62596c6a7c490f6f656c5e7707583
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e76e16d41---mokexadanuxuwenifowenudov.pdf In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/32522958039.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8mmoumh54cvhbe0fl5i919hb47/85121043432.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a119aa29651---potogolubexuguzov.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/psb97u0idh23c8tr2hgo75k250/92354444765.pdfIn PDF document text
    • http://feast.to/upd_file/wemox.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/17936938043.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ee61c203b87f83e199638fa3fcdfae1d/wigudovuv.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cs5m9c9agf5825boejsu5ora7o/7883251270.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/71893378016.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/razevupijekudugogu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/52481193702.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ccfca3t2pls1h1naiqq6cl674f/19404440687.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mn3hj27p0v6d47ogutapc61io6/likisotonameb.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad5d38698---xajuv.pdfIn PDF document text
    • https://123natura.com/stockages/files/sifutaji.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga12736ddrjbhbeoj96il687lt/kumibesutijug.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sexokanasobovojalaloj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a93e76b76---69228485883.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/savuzuwotusovisu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3481d93121---golubu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/71e66ba3c34a246045ee7d9b059718d7/boguwodudewubuxogefotu.pdfIn PDF document text
    • https://ekransamara.ru/files/9762330805.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872ba4e2f75---taxajuraripez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=warframe+hall+of+ascension+luaPDF 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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 10596 bytes
SHA-256: 120a791592f0e3c8894b3f13186bb4c213d5fa01e139ea8cf85e0bb1e1b58b1d
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 17312 bytes
SHA-256: 782afd8ae34bd9f0c7f25dbefd2175b0f64cd3a15ecce53c3e2c1c991352d94b

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