Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d4bed73d49e0e4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 22:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22060c56a0c1fb21cf3d235474097a0c SHA-1: 1b60d651eb5ab501c6628194ad3f129de4e4fb6e SHA-256: a8d4bed73d49e0e4414b3f9c9b3c1546b0dcd9cda754a6546893e873cdc21171
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086d97fb0e5c---94801723722.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7dae8b54---96698775703.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdfIn PDF document text
    • http://htwy.com/upload/file/nugopulijebomufifojo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9939b1ec99---67317368687.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28f22558e1a44e63181fd07159ffe4b6/jituturipap.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9274fa9eb531772d728890a7c6f8b6c8/35590004673.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/gopomu.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kadolepuxab.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vovopumatowip.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/43556791072.pdfIn PDF document text
    • https://rubfila.in/files/file/37201284914.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/oq6q9u26a1ptqa1hncqoegm4o2/zukovazudedubabadari.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/pifofubu.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/nusigetusabutavawo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/murikolapegikew.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/97802111229.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/migesadolifivuwibanopok.pdfIn PDF document text
    • http://dalaichau.com/files/39700743096.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jajipesesivatukiv.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/vejike.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65432433713.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7cc64827c345afc4bb1f606ffc37317/menivowimejibexanuwumamos.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zabagilokafer.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/44782139411.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043001224573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=normas+apa+itu+javeriana+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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10888 bytes
SHA-256: 740b89f56336e93a6d5a533d09c94f074255a14e003c86f7d50b5ec441b404fb
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17260 bytes
SHA-256: f3d640e46012826eec900e1d16dcad7be7a32eb67d08c308892f3dadbf8287af
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.