Malicious PDF — malware analysis report

Static analysis result for SHA-256 db76372f857ce6e0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 11:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d949bb9904cbe1a6e2a2d7e443f7866 SHA-1: dd84a14c6c6c0940d5ea2cc9f38f703087636c44 SHA-256: db76372f857ce6e0597a149d82ccad3c8e7b126561f7d9eece0557848e2acbad
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with critical and high severity heuristic firings. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and link farm structure suggest an attempt to direct users to external, potentially malicious content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d1b75765---36300421380.pdf In PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/20316303595.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/jegadelifamoja.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/torijukaj.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/7498003236.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/penilonejasinudozinoto.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/45f4e043430d50aed05f54f1cccfab6a/814485510.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/pugetofirexap.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fatapukaxosulunemuguke.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946add1d830---buvupani.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9aa0b2da3---14613264920.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d48600ee9483f1f35e288e0cc5681067/34277812779.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082607825686---54480206921.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/11817782885.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/79898751668.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8017ddf3---68372990447.pdfIn PDF document text
    • http://www.puhito.hu/uploads/worarubaniduduseliluruka.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210831_99CBE333490BE012.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/56810207058.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb4d4c12---pokokumawek.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce604dd2e5---53604211750.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68b3a087e---32814415877.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/bakog.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050121290073499.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e346931093---97133242525.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ab12757f269ebc6407288788f8fdc2ec/gudijemixax.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210728061630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ethanol+and+alcoholPDF 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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 9956 bytes
SHA-256: b20e11a567bb523194abde56d4da542916d220ab56e503031e3c241c337851c0
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 18152 bytes
SHA-256: 9c27a8b8ea4d7dc78979f94af586b097c776a47c3ce63367c42d089a3b1844ef
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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