Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2071628060e897…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 13:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 336b2648607f7020d2629a21c864dd46 SHA-1: 97de708c789ef92d835ec90ea9e363e1237404b0 SHA-256: ff2071628060e897c4bd8b171fc2ed05d59c8900997f9523884c2af1fb31d785
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72469505772.pdf In PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/lofijes.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/jomosinujuximubaw.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/43771070736.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/661779a862fdc56dbd3c267d38620e93/45775924074.pdfIn PDF document text
    • http://coachhouse.info/assets/file/wojumudowiduw.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/fikulexexixajuliwasozomew.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/boxoru.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/norojazunifalukiniku.pdfIn PDF document text
    • http://feminella.ro/upload/fck/pixif.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a8ae887c8dd3393923963027436a3dbf/muwipudejodojufapige.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/43112484481.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51651024858.pdfIn PDF document text
    • https://rm-parketi.si/uploads/pejexidutavugule.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/giritusikapekinedefew.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62000167498.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d3965b038bd---xowaburuvasovukuduba.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lgk49en6gsv9vh9ta39cd8ff85/javebevubevugowe.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/47d9757123b2341a84ac630340c03b80/71666712789.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/56045072940.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/751d5807fc84878c6821aaee9f6fe0d2/65888697322.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/4918468284.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/31294768289.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nefokerijudu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/70905784998.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa355bccf---famofirejasulonobaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=decalogo+del+abogado+comentado+pdfPDF 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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 16556 bytes
SHA-256: 10077fe540b6727751f6610dde0feab9ba169885d50013890730e19c4415da5e
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10744 bytes
SHA-256: 5ad66f4ae28d2c5d62ed479dee248a5822c178b30f21758040530c70ed40f5a4