Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1ab24070dc7ee…

MALICIOUS

PDF

93.1 KB Created: 2021-07-30 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d63568edeba3cb69a756cb599731e8ec SHA-1: d07b8d7d0c680ed533eab2136eb6df40cdf8d26a SHA-256: cfc1ab24070dc7ee45dff8949c24d16da1ac97d16df8e26ca26443b64ce82825
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769d848110e---janawesopolaxija.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/tapavezorikamusolokut.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/41441817060.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/ronitojipakipefasa.pdfIn PDF document text
    • http://chineseclothingonline.net/File/bigusunexizibe.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/savaxorutuxefebilezexexu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/roxumuzonuredosemawekorav.pdfIn PDF document text
    • http://geose.ru/userfiles/file/tufuzewitodametezirawim.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/50847599696.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bgta2avknt9sng86hjmj94m802/bibigin.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8af1bb417a95293496cc621fecdb3c0/57964953.pdfIn PDF document text
    • https://emmaushuis.org/pages/17640914344.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/keturomekinezejofo.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/gesodapilato.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f47a04405---13351948893.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zizer.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wuregoretujuxidasanax.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/87736961479.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1884e86d---88691377650.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761972398b4---55414992023.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9edccabe---budatojuterenekuvisuvikod.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091747a58a3a---tomojox.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4193225de3ce75aec40ebb7f713e8023/77888099873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=filipino+movie+script+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_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 17672 bytes
SHA-256: 7b0e51d4558a726bd1a3abce28391bcbf1d52421013986362f67fb16b35b30c1
font_01_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEB 10660 bytes
SHA-256: b861a73a3e95a34c6b56b2d2fd484d4d2600252c07dcfd346bf18326898343a4

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