Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f2d27a8f2e4f74…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 15:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4887fb491574e4a45e7958ee92ed4db SHA-1: 891ffc71d4272ab40f47ac9fef7ad8e91bddd500 SHA-256: 41f2d27a8f2e4f74e171afeb58904ed0079bf4ea4039190da3d1452518fe8833
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous disposable domains, indicating an attempt to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clasesholandes.com/userfiles/file/69250486968.pdf In PDF document text
    • http://king-pro.com/userfiles/files/87076199195.pdfIn PDF document text
    • http://yepuco.com/uploads/files/95762450650.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a5fd4be0c1a06d095694705d040d3d9d/tivipemoz.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/85200166368.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/xamugizilat.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/84736045558.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/solawulinurubizitobupele.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jefolirono.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/palasulelibapuzenadosu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab7a0fa4a---68169830686.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/soduvewegokija.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d049ed5cadb---powuragalegalad.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18e32d64e---pululafamamejevixuj.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/41432120964.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/66477259816.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/8436917860.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zevovofixogexodusezozu.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/surabojujemeravetal.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9ca63fa15eb6cda674a01722a4b52494/47052830317.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273b3ebcf09---tagagapegovivabifi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4b3ea1466aabdc55d7960fee446c8de4/84028067028.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/matonugixojozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=counting+canadian+coins+worksheetsPDF 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_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 16432 bytes
SHA-256: df4ceb1d171089552de97afdbe060088a5d555454e546fe2f16aac82a50f6e13
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10912 bytes
SHA-256: 4d915a248f609c3192b790a013c469c9796b77d4d98a8620bcdff824ab2d48fa
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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