Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda6e337dff736d9…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 23:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b43e55db2ef5f987d72048541d952e29 SHA-1: b14725952e7db60d95391244a638c026d5ebd823 SHA-256: bda6e337dff736d9e855319bf1e72f60c231e90bd1beaee85d357d186cc32f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=marketing+goals+for+small+business PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615596ce18f26---tizofifa.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/33125219415.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/mifojotunuboduriwi.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/34396269294.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20211001092051.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/92071591095.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/30436154154.pdfIn PDF document text
    • http://skupka23.ru/upload/m/84386831101.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/guduwonoxenutakeboma.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091417114569.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/28473179088.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6684ef33---nujowijolomigoxata.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/15337877572.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/95895459770.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450235e8942---34643655406.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/82880035609.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/92939425600.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/62766396892.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/29117958615.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1633289327.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/92805200070.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/nipow.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/27g6qpht87p925h216fqeh1vph/zatobazikuvununa.pdfIn PDF document text
    • 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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 16632 bytes
SHA-256: fac0f6480478fddc0f9d1172af205649de4fdb2753d0d507c3e49635ff509a99
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10884 bytes
SHA-256: 03e7669158f91b23cb0b628e2398b52f18c9b76aefbd1cdc3d330c8fb4fd6e5b
font_02_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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