Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a82af2c49a266a9…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 22:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aafda58ef49529b0dee4d8ca79309c3c SHA-1: c2108207d81fbd4ae9d8436302f9402632fdc78c SHA-256: 0a82af2c49a266a96bcab1f12d6854b3a817e446e404d8cb9d9c92029fc04d5e
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files, likely to facilitate the download of a second-stage payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c3a7aa22dda65325d5aa2b67634a328a/gimagilukafipamedewi.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4c1r2m6idp4e6856reih7q31vd/64757657442.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/34599515373.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0q9u0i5ahopfe7cnf7h33fk7e6/jigexijedobiwasedavomose.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724f9b653e5---23393772121.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5p1ghnere3cr4rsh6fq22vnjn4/rovadanelejekabolasuf.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4817e6ae4---furifuxiletejebipomewinu.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/towutafimito.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/tupakigofenuvaxepek.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xolatexo.pdfIn PDF document text
    • http://dalaichau.com/files/30782481282.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/umuhhoagvem32ismr93m69mnql/58976813727.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5c31fede8ad5f3d9de475a66a53e0af4/waregalavizusigidud.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bfllosa34r6q13q4cobmrdmhm7/senunezibakakunatirefo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd955dfc6b---6090360354.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4053071295a4acb9177c2ecbc8f61233/87259066529.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766340b0a4f---92552152333.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lereweseregolelaxaxu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160991548f13be---85185973288.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cfccafb1ad11b13bd1dd75648b1e81c9/dowisubadufedimevomatuto.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kukusagagerodudote.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/xubofutawotegezumaf.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bf58c9a64ed948a77c14112f50e6c2df/datotiw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mowisukuwolajaxilefari.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jidaxijosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2+follicles+in+right+ovaryPDF 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_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 10820 bytes
SHA-256: 792f6fded5d296012d9a3b9238d5c55784051a57e9a6bd8c46475f83a29318ef
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 17848 bytes
SHA-256: 581bad574ae5594f03fce5e2e6d6a735a8cade36671851fb635db07fbbac1c9a
font_02_sfnt_off0001487e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1