Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf57b178e63e6c9…

MALICIOUS

PDF

90.6 KB Created: 2021-08-08 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74652345a4879738da7c56cbf94afb5d SHA-1: beeadd9706c5d8821985203b8bc5c50e93d0273d SHA-256: 0bf57b178e63e6c96db933de2442be5e8583384c23add4c06f70eaf02aa3584c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://winkeleninzundert.nl/uploadimages/files/94869318135.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8ca3849dbc9560494bc277e9f895d65d/21966665494.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/33692259328.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b5cad37e924e5457e37304d73ba6fa7c/11029778614.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1003866755610a635456e23.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ca08263516b413f24c9f38c2f98528d/tadujelufanab.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fiwobilokize.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/15166700406.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df96afb0c0d---vefafoxunivazu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/pikurowebulijo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a846576d19a940aa8f9570391e132f59/41065278731.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af77af54b85---33626702797.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062812193173499.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/wanubak.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607966578b860---zirivapejikazona.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/vofum.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/nivipowoxusovilo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/63891048190.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/7899741184.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0779245001620289544.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/mosigogo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pofawosaziderovidepusolav.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/nupadideboxofolado.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/disusisul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hunger+games+catching+fire+movie+castPDF 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_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10896 bytes
SHA-256: 2ff650dee6f9eae709c1586bb8bbb807e88d81d9fff6235e18dfdd14b4b52d3f
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 17368 bytes
SHA-256: 52c1332c9fd289b8d7bb163d60acd50ec3d48f0ce7ce0a8839a047e127e25062