Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f116e6c94161e6…

MALICIOUS

PDF

92.9 KB Created: 2021-07-25 11:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cddb051096ed29d3530c555a5b4029e SHA-1: dda11cead5e1205d11013b9cf83f319cbe8c1638 SHA-256: 04f116e6c94161e663d331b1255bfcbff6e4822b8adb39b28edd6f35fe6a85a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://akcjonariusz.com/UserFiles/file/7227752127.pdf In PDF document text
    • http://parkhigh65.com/clients/4970/File/907893742.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210723001206.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pewawarapa.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/13b449da69cc1a73d151f438bc083646/86884895874.pdfIn PDF document text
    • http://korytnica.net/data/files/37958294708.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/10525507636.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d51ec098f---xujavutezepafo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607257eb5f64a---17402748657.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0a59b850269ca0064a7cc5f43625cb7d/vowikiwigepil.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/42611887468.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_EA049EBE0CBA29AD.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/19214462431.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t4gsfqjhfr6fhj02eq29ng5ft1/28417842865.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/adv548331gbek1d0qrs53bakae/39471405218.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a81c38e42---jotimixejonir.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d4a13b05---naralofulokijiroxunefu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a4de893d---xajunalezenuvuno.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hsmaf2l4toon07rll94obiqkc/gomuwomitiwukida.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c782d5130---87298399030.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ae75c3df---59073289852.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/tumewogibin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/geloselebebixegafukesesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+grbl+g+code+senderPDF 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_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 17636 bytes
SHA-256: 6f13aa34d17e8050f517672e4d90d3f36522ff5b79082447a12c1fe3429e17bb
font_02_sfnt_off00014e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E81 10484 bytes
SHA-256: ab67d25e4c5e0eed2019a03b033133c2da8139809c81eefc3a323450adf5602c

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