Malicious PDF — malware analysis report

Static analysis result for SHA-256 34971d4ac59a63ba…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 22:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95ab79ac808ff41636ff532044bc5c79 SHA-1: d795a3f4d4fb88e7102004b2a25187368ef84f46 SHA-256: 34971d4ac59a63ba075a3fc08f03765876bf9bce05e26dfefdeee3853a49c450
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7d36a4b6---89906006305.pdf In PDF document text
    • https://aydin-elektrik.com/resimler/files/83524724540.pdfIn PDF document text
    • http://akssert.com/userfiles/files/97133683882.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/88738541660ff52651f5b3.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160987c6a1bf25---13911366940.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/35565484004.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cd97a8ca---sixekemovuwasolutoziwas.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7567e6bcd4d967b5b4012ac5af84c2cb/97822701820.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6543f2ebf---wagit.pdfIn PDF document text
    • http://atek-ent.com/upload/file/foturababavuzowowotux.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1f92ceaf0---53034958273.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0005ae786d0c4386fe868d3c865fa655/tezar.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/557d5a453c384df852e62c20cc59b259/72243445615.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/adfaad32ff59395f4af31722d6e45087/27190856522.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/32691680701.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/limigoropovula.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb311c44---23957244604.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/daduzezabaf.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210616141248.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/juburov.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e8ee7ff34750f9c3174e4f4c9e184d0f/68771352815.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160df52788b73d---xopibinovifuzuxedugatofa.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/16802239586.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c43c6f3f---41245895332.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/37835057786.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/sutinejotumejikuxaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=remove+pages+from+pdf+acrobat+proPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 10972 bytes
SHA-256: a0ad1565c31e0de6827d0aca9c8a56cbb4beeb6980833d44f62847f5ebd9c5c2
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 18200 bytes
SHA-256: 240db93962fda14bf6439b00c5314d9c93b2e9efdcdfe7acb896423d92864b8f
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1