Malicious PDF — malware analysis report

Static analysis result for SHA-256 df76876483402c9e…

MALICIOUS

PDF

88.0 KB Created: 2021-08-11 00:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f84eec7acf01ff9f13df66e3861b2ef1 SHA-1: 1107fb4e2bf015b2ecd7e43d8fdbd6dbb7895ce4 SHA-256: df76876483402c9ee836a02a44e498ac0fa943ff94dbff4766c3ccaa7ff2b6f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as a malicious PDF phishing trojan by ClamAV and a machine learning classifier. Heuristics indicate it functions as a link farm, directing users to various compromised websites and potentially malicious PDFs. The 'SE_CLICKFIX' heuristic suggests the document attempts to socially engineer the user into executing commands, a common tactic for bypassing security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/simuzil.pdf In PDF document text
    • http://maidichike.com/upload/files/57482150712.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/97107121699.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/butesaxipifikuji.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b74f1e2d3aa459c58a54c152b60c4c31/kepudarawam.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b6f0194---83877622632.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c630f6a4---90791107191.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/rufubafifolo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ce66c852---86451994929.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83bb430cae---96221947083.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160719e3b3cecd---gabeda.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/viguboluvarazogatixoji.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/jofinitikebugilofemo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lisowilopokowezi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/883d2532e2cf1dabfca853f8bab9c199/wemewamizezebomijifike.pdfIn PDF document text
    • http://goref.ru/files/file/xinoxa.pdfIn PDF document text
    • http://philboyd.com/vufoxo.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210628044148.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4c696012---wulazononufifigego.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/nevegujafesil.pdfIn PDF document text
    • http://alptw.com/images/files/babisigut.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44e6044921---rarujadumo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d700a8ee---bagasarefojule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+mirror+my+ipad+to+my+vizio+tvPDF 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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16944 bytes
SHA-256: 8c3cad791ef7da8acd4d17b4a5310caf4da9200fec80d7dfeceb2612fe1db024
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 10420 bytes
SHA-256: e5f8cb10bf2a74b08839df1d09030a49a27523f11ed25fb15890d602dedcb3c5