Malicious PDF — malware analysis report

Static analysis result for SHA-256 6184c4b767c42271…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 16:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d848abaffc13c0e905fd4653b85c37d8 SHA-1: 7300dc2f362b253ed514f6a5047aac12b451865f SHA-256: 6184c4b767c4227135b59cd3dc37f9b67451852339422088d094b906429f0ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are likely compromised or disposable hosting. The primary goal appears to be directing users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://dogalakustik.com/depo/sayfaresim/file/86550389070.pdf In PDF document text
    • http://jocoseatee.com/userfiles/files/59053980018.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/kuduzog.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/26549382916.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/46048519599.pdfIn PDF document text
    • http://henca.com/files/details/file/39149838788.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifanunajizuleguvoju.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/97681229219.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210908075816.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f86adb95---nalerozanumoziwak.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/30800440678.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l3fbh6pld5i3cebdjs8k2i7bml/vugitis.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/kerusogenumodixutojagek.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/lamiripujimitomazizosaz.pdfIn PDF document text
    • https://istanajp.net/contents/files/femosilutonemetedukato.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/puzedaxujifu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/votuzogowodudituwekiv.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/48013343795.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jejefuseninizijewelane.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zezubegekekuji.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/84522374286.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed931da98d---xalimop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+popcornflix+on+firestickPDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 15556 bytes
SHA-256: 9db1ef953adad11ab81d58fb064ac06f4740b124680bf3b158f1a2094b3c2c30
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10884 bytes
SHA-256: 1f09a346c0b50b30a3d4c74e4dd8e88f2b3e8d488d15a0005c44b3cf14d1d68e