Malicious PDF — malware analysis report

Static analysis result for SHA-256 4782636c8d961df8…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 10:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f80de88939c5395d9b92bc2ecbf37d37 SHA-1: 2909d6bfa9c5b326b1fb4d1e213ffb916dab3ad7 SHA-256: 4782636c8d961df8962f21d169430146827dda78ab61dd121be684d807049dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing links to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV also detected it as a 'Pdf.Phishing.Trojan'. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was unreadable, but the URL patterns suggest a tactic of using compromised websites to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • 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.
  • 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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612130148387f---93841436466.pdf In PDF document text
    • http://agavietnam.com/img/files/molanaman.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931b0fe8f86---zovutebujegemijolamomu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/kodetumavepikawaraxisow.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/nafenopaperimubuluv.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c36dd2aadf7e1f54806ba3816860796f/pobelit.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/joxujum.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zepalorizizudedola.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nuzivagaruzaw.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9523e29ef---jaleg.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/83180519725.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a1128dceec67b1372cdea19f6061e2/89988078212.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/49553576704.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/36037623991.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/2044022870.pdfIn PDF document text
    • http://mfcpavpos.ru/file/38527855646.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tanimawiz.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/98745592539.pdfIn PDF document text
    • https://baptistfriends.org/media/puzuxonuwo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezalikitisowigojotop.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/070e3f8ece194e1d5639d9100e7cfe74/59691676615.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f752a0260---falolewasokakajadipose.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fe82c286---7548248156.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lejuboziro.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210828_F1C840AF0A072496.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/demiredegapovunesosuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+intruder+roger+cormanPDF 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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10668 bytes
SHA-256: d68a0673aa82d81a4a36208faea41af3b2d8640eb1df59cc05eb741e89866a95
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 18748 bytes
SHA-256: bfc0cfd9628768e32b9e94d67a4a327c1893948d2970110afc19782d9f83f2e9
font_02_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.