Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e684626a7e8702…

MALICIOUS

PDF

92.8 KB Created: 2021-07-29 18:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f75d0391bb800bd1dfdc3e307a12824 SHA-1: 5504c4c76ce97bd1be514c2eae55fd38f21717a2 SHA-256: 41e684626a7e8702c346ecfd266337b64d88503129e279e94e21bc5f5e4acaca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS upload directories or disposable domains, indicates a strong likelihood of it being used to redirect users to malicious sites. The document's structure suggests it functions as a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=b+h+c+ka+full+form PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8d217bd84d0d77bd59b7c588dc523f04/8540709631.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/31180251861.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/df823b3563aeea9a1ac33e3373624c9a/ripebedo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/82146666294.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f7fnuc0fh2oc6ms5ujjj6gk513/13061485358.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/97264500501.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/27125768498.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/32528971684.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/698381372.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c28baf38895---zajidakavoj.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ht9n5kch7vvmoa3ch301av7lk6/14562034617.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/basemizefinur.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/19019421092.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81a6518f5---sumopetezafuwinowitinosij.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f289acc8db---zonigidifigidero.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/91343193500.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nuxivi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a01d3223---4379611601.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/11945947481.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09646e240---vejovim.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec0e290a64---zoxerufa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f1bcfa131b9eddcddd5183da045cf534/zatabapatu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/sokufivomejupex.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/44206819243.pdfIn PDF document text
    • 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_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 16924 bytes
SHA-256: bb3bc88ef515d4b62782a626a307df375ae0ca5425fc112fdb980e72c2af1c16
font_01_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 10252 bytes
SHA-256: 034c4c437ddd4ac5c4afa457c06e29c1af75f77f4894435d5fc6e70ddd6aaf91
font_02_sfnt_off00014d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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