Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c03f984cb4c2fd4…

MALICIOUS

PDF

92.1 KB Created: 2021-09-07 08:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cacf2e803aca29b5ddfbffda4736c1b1 SHA-1: f9117874eaf1a008352afc0c6237db39562bd911 SHA-256: 1c03f984cb4c2fd4af44697baaac8a8a7fb1782668a15b7af945cbb43e2562ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=maquina+de+lavar+electrolux+6kg+turbo+economia+manual PDF link annotation
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o8uod1j46b9ev6pfkijlu8i562/dobavuserafesoxinizev.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wugoj.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8e3545fd---18325346168.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/87115380758.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/850a672138c7dec17c22bb96ed225a90/lewowutisade.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41152d0218---guzipu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/repub.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/8268fde5bbc7ddafa5ec05f96be82ead/81594291885.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ba80ee8dce8e5bf04cdd2238a06e0105/roropilipezug.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40535692240.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/6323603570.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/jerimif.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8617ba309---49424450016.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/2284207636.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/74204495855.pdfIn PDF document text
    • http://lyshiying.com/d/files/33160439916.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ecf3418ac12472f94d98a77f1e7455c1/60746593068.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7b1df94f538e57fc0552df6d8407b4dd/muwunet.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/lutukotarudulixinudimej.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/63332148416.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/24600425803.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/zozenezokozasoveripafokep.pdfIn PDF document text
    • http://stromzeleny.cz/file/51468950608.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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 22440 bytes
SHA-256: 5829971d37ed4a7a2fdee7b885ff47710bf4dcaa370e9ed3d264b82fb4fc5766
font_01_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14865 11352 bytes
SHA-256: e6aff9e3e91ba4ad24475e0071a29b2f253cbc8e8abed7e452b80b6523ab6fb1

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