Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf8107d527acd5e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 12:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b10d5ca5fe86e1568550e98e53d07d5 SHA-1: addf5992de413b91239c07995f3bc12491c21ce4 SHA-256: abf8107d527acd5ed27d4da98273d11ca23e3cfd52fb3c0f39d86ab6dc93ff15
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 or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://goodline.by/userfiles/file/89752363954.pdf In PDF document text
    • http://cascinamana.it/userfiles/file/xenifevejezidukixifipodu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/84367446816.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/26870243228.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/likipesus.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/54872163646.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/muralejojobodesodi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/98613893983.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/72533070228.pdfIn PDF document text
    • http://espwireless.net/uploads/file/sejonezuvojivawifejun.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c9dcd88d---52164273491.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/warejir.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/18145044349.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7b5fe7d3d586f3c1cd98226c8abcd6e7/52881684292.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091514371873499.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/98693691197.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3308b0b5---77708866963.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d4e9f44ec179aa342050ff5b55a784d1/60077935788.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/35064315929.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/16107588868.pdfIn PDF document text
    • http://saktigroup.in/uploads/sigirizu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/84ad2b5498799d1fddb5268d7bf27742/bafogedajofomeva.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/56539086852.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161458ff2cebd1---61996393185.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/39267412058.pdfIn PDF document text
    • https://davaocarrental.com/images/file/75982587243.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614119d946302---kamotuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kingdom+rush+vengeance+unblockedPDF 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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 11108 bytes
SHA-256: 62c705c5df55cf550b102e3bd93e124b0c898ff1525fea92509e976a7cd478e4
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 15380 bytes
SHA-256: fc1bf66d197062c58604ed9c7aa5882c91872c764db817bb7bb6e0ac8a14ee07
font_02_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1