Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca147ec0792a8d57…

MALICIOUS

PDF

84.7 KB Created: 2021-08-12 17:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9eef6d8b0e2c99328632f409cdcb8d26 SHA-1: d99dbc17c3127d1bfc6451ddff9ce20a61306985 SHA-256: ca147ec0792a8d57a6b6794a1d87be0e66b941d37ca38447ac2267bcfe054d67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://owv-sad.de/userfiles/files/geborutadikamoxasosenenev.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pipagopabevovemarol.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e71c5e49---roxivebawojilaboseteg.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/45646498219.pdfIn PDF document text
    • http://mosjob.ru/images/file/95083122697.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/49120964820.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2cbd640114eb83a40adec809bfc17cff/xowituz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390785d192---89755153900.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d719a853421323b50f029c8b5633d02c/linavimofezami.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/076c2c536d5d23fb984d35d3bb714c33/37966496328.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/26838898853.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/18297234849.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/nelaz.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c01d8dd9f---miwetotu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e13112e27a---weliwetavow.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e3321a25ed15654a0ac00dd339d3245c/laruwadujozisedefekivuf.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608659bebb97d---40515695635.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085d18b6d4d7---17922221774.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/latulivuxonixomuwafitopu.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/90514152111.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tlb7asjirqt5iu73gbb5jjca9e/82658865148.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a94a93f64---28201992587.pdfIn PDF document text
    • http://dges.in/userfiles/file/kusesivujezugosi.pdfIn PDF document text
    • http://lucann.com/Upload/file/78879358378.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/29664943522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=holt+mcdougal+biology+chapter+6+study+guide+answersPDF 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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 11560 bytes
SHA-256: 26228aecf6264f8ee8f1521b7cea2169527d7b26d155352a8607828f224e44fd
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 17192 bytes
SHA-256: 74ce4091cc58ce2c2aee1a312f8e91499b898324ec80128fb46731ef341c167c