Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6537250ad732693…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 13:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b0e03fc376ccd8c494a82781f8cdce5 SHA-1: 4d30676c27a5aacdd3ba6a62f261f17fde4e8d41 SHA-256: f6537250ad732693a8e76d8d3c5951096c14377ee0913cc4c5014dbd3ce52d76
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick the user into installing malicious software by posing as a necessary browser update or plugin. While no scripts were directly extracted, the PDF structure and embedded URLs point to a phishing or malware distribution scheme, likely involving a JavaScript exploit (T1059.007) to facilitate the initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/teruvozewakisosometapes.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ke3ocv6oiig1ihdcuj01tehl58/58214678091.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/medibugevosoxikatumanew.pdfIn PDF document text
    • http://sswjeans.com/files/96624118555.pdfIn PDF document text
    • https://laps.pl/userfiles/file/fufemadasivilaso.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vovewekobedelizedujunoz.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/95070523074.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/jubig.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210917013319596.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/muzoxonedikux.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161326d7adb671---jaredibe.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/59852682728.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/40049981831.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210910065455.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vixogevulodagejixi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/92980619757.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/zepepe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829b96e9f0---15068493335.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/fesufuladuxewufipe.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/618iuvlnnrntsnjakv06dg6d5f/sofupilamugifipova.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357536b63c7---59061919038.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210913141326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=amber%27s+magic+shop+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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10820 bytes
SHA-256: 993b22d8e94bc5f26f6ea89509986c883134d723abc8fafc88c6fd4d26cf16d9
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 17168 bytes
SHA-256: 6e109f2fe6fea9b4ed4b4a4c8868c4e65773524025e7d81bd7cdd2b70c4b7da1

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