Malicious PDF — malware analysis report

Static analysis result for SHA-256 e146f347ade8e8db…

MALICIOUS

PDF

81.6 KB Created: 2021-07-08 03:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff0a0e14c917cbe39c8ff8be81a7287d SHA-1: 2ccf0312aeef29efdf3934cdb19a9b93aa260d96 SHA-256: e146f347ade8e8dbd5856ec21707165760bd78de0446cb389274c0ea7a17e3cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress uploads or disposable domains, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cuatro-pr.org/sites/default/files/file/roxonin.pdf In PDF document text
    • https://atl-50.com/files/file/fitufawuguronolonu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bfnt4fa7ai8dbmuck7pn7st56/77372572451.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lajenavuzopulopodibaj.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/56458912841.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/kodofinefadoxujemekak.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/046d85ee0ea88e41c2b7472251288627/fepisupu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c19e9370d692bd8c2e52faad9ef059b5/zofitokifopijivup.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/47141245385.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/67116858677.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/60632607878.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9f6d5506---pozaniratuveginevope.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/48683521304.pdfIn PDF document text
    • http://vnplastic.net/upload/files/tivotugebezawotofijuta.pdfIn PDF document text
    • http://alkanboya.com/files/file///fotazuburotodedelifumo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71174ebcd---gonuboweselu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/205e9a55baf916fdc4ba7eb534e8f4b1/83668796665.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/mimiripowivi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/051c0d926a8a26988a76ac0b37d3d15d/32501167086.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fj7emdqgcjujo7fpbongfm4dub/tazasonujibupiku.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/19392064986.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avbprull7mgkrgkibgmc3a3mub/83671068664.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ddf4cf81ef50e4ff4a18c49685e44f60/66406001480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=electric+charges+and+fields+class+12+notes+for+jeePDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 17368 bytes
SHA-256: 5e216dca5372b3d9b4e978d391a3f04bc3df9b46973138bddd41447c7418a192
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 11040 bytes
SHA-256: 30fe20e8e89db0de70afbc97cd518cf4191f4dfaa56234f74ad6c505b9c45257

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