Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a835e09332bee7b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-11 13:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e312087dff6c13413f99af0b8a63158b SHA-1: 34cc9a99fb87947762e93664cf4127fcf6662e81 SHA-256: 3a835e09332bee7b3cad7c54d043480a59dc8395b000320aea4fd218e0554c4d
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. The document also features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=major+difference+between+central+nervous+system+and+peripheral+nervous+system PDF link annotation
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bfbc8eccb4cb6cffe07387e8261b7410/raxelosarezezederegutude.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eelvvtb5g2t65bed54pfr6u7m0/14808204422.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/46536315727.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/bizupadeb.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f6cc32c2---ruzos.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f5e45776---74079820056.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/ruloselugejetazosorofeje.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/1753d0c60f7f86f1e7ae10c2a721ec33/xenabigovodifidagep.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/57859133386.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zesopejolap.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a626781b5---vorawodafewez.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sb8d7lkgg6kp3vo8nc57cf4576/67493936447.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/efd1ab254bb27c2d7a700b6b17474989/nulezis.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d5fb130f4e2f6790a0e7c7cef34e10d3/72224661472.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/ranikomib.pdfIn PDF document text
    • https://theurbanthinktank.com/files/baposakonukewijog.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb4d56d5499df88d58459a1f8c4327a/27600970431.pdfIn PDF document text
    • https://petala.gr/userfiles/file/81737381353.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fdlnl1npbl5aj15q0mbsgcrdhp/61173721240.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/35583484196.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/jofuwamasalebomobiribe.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/fumobuwujez.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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 16572 bytes
SHA-256: 0b659c78d9c22ab8cee8fe7ccbffe1766e19e0deca9182ee35d419ea5b524994
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 11516 bytes
SHA-256: 0d209f465ceb698a3698e653a8a73a7b1002d982d68de2144707c51282641d5d

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