Malicious PDF — malware analysis report

Static analysis result for SHA-256 d233b12727b008b4…

MALICIOUS

PDF

78.1 KB Created: 2021-08-15 05:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9432b1c71cdbbf8d1c1b06a09a2159a7 SHA-1: 131547071e0cdc9be5f9a01be5802a0a00e217ad SHA-256: d233b12727b008b433a2b162bdae6e0bddf64214e8b8434d471a6a3df378241b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c49fec06af9---wokowixugupagefov.pdf In PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/80393924738.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/58099274544.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/73522747404.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gafosipan.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7307856e015ae2671739ce31104d33b6/naxawolipigupetiza.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dafimi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/12527326988.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/01def210c13b249eecaca2de671088fb/debirekofidovajufa.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/42897720033.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/25738266019.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bfd19f968b810fc1f178f5c208f0d871/5536754584.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/66822954080.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zawemeraxakavamuwexejezod.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3b18c5bb52f4bf6a00a6cac8d0840229/1289984688.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ffbdcfa3---ruwikujapar.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/56922627542.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6ukkmg19445nuic5ecfhsvqjgv/71539928242.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5634f5df---foxedaladamu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/bda15c329d40ca388eec0698f9aff7f0/95350413503.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/84143669844.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/nevojuvebewaputuxenivap.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tudofbd5jdeolqi28c5mbkuim6/30730912732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+twilight+breaking+dawn+part+2+sub+indo+mp4PDF 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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 11456 bytes
SHA-256: a6fdc686ecd919cb84eb824caf9ab1a601871156c693a8d812e1a9d7537d85a1
font_01_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 16656 bytes
SHA-256: edbccefb8bcac7e8b4cdfd35aaff75ecbebf75d4d2d0fb65b28da54ace42214c
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1