Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96bc8e1405dd64b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78eec724f55b53586657b20c59717d87 SHA-1: b7cfaebe17854b0a9504271a8c4909dea3d1dd1e SHA-256: f96bc8e1405dd64bb89a99be5b1dfac2eafbcf636d89304b5bca1d53f8a01015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lamgi.pl/ckfinder/userfiles/files/bifate.pdf In PDF document text
    • http://sensi-leszno.pl/userfiles/file/tuvixekiza.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/lovevamutafewufujuzamige.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/45013634979.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/24180035351.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/zaxavaritamaruwage.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/kijurezasokelufukama.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/kiziraj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae4169568---jimoguxigilo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52241942684.pdfIn PDF document text
    • http://falconltd.pl/cache/file/86482144866.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/digilitemigerika.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/xapagaxexoginovijigijuse.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/jozuget.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/63016545250.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/xugobibomop.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f389a37bab---5593422980.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nixorarirejokaji.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/63211868697.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dapoxo.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/pawiz.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90616647751.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8sm916a4tdtdbh1m3l13gi09a4/jexonoserobites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+connect+to+wifi+network+on+android+phonePDF 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_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 16136 bytes
SHA-256: c41c37328c9b4eb3c2660c91ceeb3c66e87308a65c13324f37b8d68a2be54f39
font_01_sfnt_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 10672 bytes
SHA-256: 91a382de67e1e1462edcc5fed8c16f9a9fa28ab185a93ac6db1e17223fdd2470
font_02_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1