Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b811d0230cf09df…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 11:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9321ff0fe64ce6ce11780d03fa78cac5 SHA-1: 14c5d3241d928c857f7b2af94afb99f7afbde5d2 SHA-256: 3b811d0230cf09df2074db905b2fb8036dc9d16a6565d97a00ee87e6bfc0469e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an embedded JavaScript stream and functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of JavaScript suggests potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/17202748178.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/246tdvtkdah24nbhpknhkbo56a/vanovejikopegil.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/59953697905.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3dfa4dfc---purubewolavudegod.pdfIn PDF document text
    • http://rurisnet.org/images/file/kaboxu.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/wumewuxono.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/xulumizena.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/49756957028.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/75027974178.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/40612395654.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/muwivaninegoviremugedefub.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/xazonavufazorazu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/77844434429.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45467658582.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec48ab1536---momawenaliwuliribititi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jebegavujefedij.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210913075238.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/xutizisununavedij.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24ae80fc1---26157704332.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mebizetuwivamurireja.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3trat4grobs5u0vocjptloq72n/59338311674.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b94563ac81c14a6276b041dc9166ffa7/15211025253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c4fefc19---75665012429.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/60568975724.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fureluzonanakovojubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bollywood+songs+free+download+mp4PDF 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_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 17608 bytes
SHA-256: 08fe84d3c0c12db23d306f656e430b98e40a18788c6c2bcac2ddd6db51115e72
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10984 bytes
SHA-256: 5aac34c53f11d81d789e7b805c6035b0a76590b549ad8d7761880c288668fa4a
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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