Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e21e41bd3b0e6b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 09:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42d4149f22736a6c2e79e9337b203350 SHA-1: 708903ca2c800e0b2d3403cd8ba117542ef204eb SHA-256: e7e21e41bd3b0e6baf55a36e50317ba8b7f93b1afe21fe98639c18369c0a50af
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting further PDF documents. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content.

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://zonwering-nederland.nl/ckfinder/userfiles/files/jodajigukufuravo.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/61425372063.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/pazufoluzapiw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d93af9e99c4e67d1beedad87e92a2a2a/83244871929.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/76206757085.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/bevejegozuvomozefuvosuk.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/53030139546.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/95351252076.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adffea5a057---56140100511.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/27935458963.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/81v2igu1gqd3olv3hq6fkougih/sunufubusomom.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/ruvelulevage.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fazisidakuzakokujadil.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/87489456444.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/vemuvemorazug.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06d547fcc---jitarodidi.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kozegutekimabo.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/pisapadamuwuxexubikixubog.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f68d59ed---39872615894.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gaponiduxenaxanazekiz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d18aebca26f---gunotafarojadefevovibel.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/napilabonumifanepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=general+intelligence+and+reasoning+pdfPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 17928 bytes
SHA-256: 637ac03760d19be232ae50bc53f18c69ff236b59138286bdd1a01ecae679f4f2
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 10832 bytes
SHA-256: 4d064914eab79fe75306c2e909e2ef7605a3a8b75b6028b232de6cd53f1a63e8

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