Malicious PDF — malware analysis report

Static analysis result for SHA-256 947e3202c7488692…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 11:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 484bddc6ef14c2080c88c0880fffcc4b SHA-1: a1c0b8023650b734d586c47456e84f90c439a2ca SHA-256: 947e3202c74886923dcbdf51b018024fc155ad2d008b11aad867dd3bf93cc282
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing or malware distribution lure. The embedded JavaScript and the presence of a link farm pointing to various PDF files on potentially compromised or disposable hosting suggest an attempt to redirect users to malicious content or download further payloads. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports this, indicating the use of compromised WordPress sites for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kiiga.ru/userfiles/file/16460973624.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f989e397---51800166874.pdfIn PDF document text
    • http://rococosofa.com/files/files/kawij.pdfIn PDF document text
    • https://proia.bg/userfiles/file/musofumawelinijeba.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/44347202696.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/rurebutisutasifotenezofos.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917085744160.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8e6da61c46088e438f9d1eb2a2177f0f/xusokurozojedogozelabogad.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dbbc078e9---jesikiwugixe.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jorenupadagagevex.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/wikenebewozasetonofosad.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/86904162563.pdfIn PDF document text
    • http://cocoal.com/uploads/file/23752543678.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484a44df6a3---kusokebesaluzafomijo.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/mitexerovirod.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914030307.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/40469183911.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/kapijaxuzi.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/26654576503.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/33484547915.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424adfecb5d---60015040974.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/16317900646.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/82726694432.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109020829351974.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92882684534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=motu+patlu+run+mod+apkPDF 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 17616 bytes
SHA-256: f2e3407258a57036e497e6e59bbcd83120e008860800fbc3f3ebe2a4328032ed
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 10348 bytes
SHA-256: 9fadb2e4dd274ca675041c0fc2b286f237e58fec87817d94d4937361efaa3bef

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