Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3d7e6e032f201c…

MALICIOUS

PDF

92.0 KB Created: 2021-08-01 05:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19672cc83bffd38dc3326bc1c9bd6ef6 SHA-1: 487a891a521a9388d725f93c87322eb990221c97 SHA-256: fd3d7e6e032f201cdb1006d87f7734a7d31613981a22c904be35753305e0866b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb7ab463d---mumafumorarolubiseku.pdf In PDF document text
    • http://adaviestransportltd.com/userfiles/file/mukumar.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3faa8762ad341abb0f64ce958324958d/wejamekadomuzula.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfad8ddf57---76014930426.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/89425346609.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/vukebi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acfac0e4b25---mupotowikanonasugezemo.pdfIn PDF document text
    • https://eguiders.com/uploads/64499725307.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2534d51eb5ce078e368740012c4d7275/biferadu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xusasasulofawimurunak.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/nojaxilakuwogig.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/41637275780.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/acog57r1m5thgki0cnc72ghb7o/67421623450.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1073e165---bulejejodurokenawekus.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dde49bd8---81830335060.pdfIn PDF document text
    • http://citralandpalu.com/new/pics/file/wisuginozagivobexogipig.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb57cb78955---80018533986.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e5fi1vhsgj17gqvuispromcif4/56219491773.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5c89269ef94870ab73eeacff4f7b4dc8/kuzel.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85aadcff0a---davujam.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ls01c0j9k4e7hceg17lf6d0d45/fitenukemenonolegurafoxed.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/fefufisuka.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5cf7b690f5d5ec0c5d67b34df3090e10/kebumoma.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096a46ca5a99---14436074063.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/ledodugogaligovajow.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/doripiwugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+to+write+in+email+when+sending+resume+examplePDF 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_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 17236 bytes
SHA-256: 6103e2870041ad1a8c10e8ae81dca624527e88116d1c1d7ac03073aafdb6d476
font_01_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 11120 bytes
SHA-256: 30e6386ed884ef44f570d0615eeca1de949104849222dcbea2d8a75577b0429b
font_02_sfnt_off000149be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1