Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ef86e0ff771ece…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 19:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1679c47e8c10312d99a0036430faa6c SHA-1: a476a4fa3a6c5c22623869efccf8ef5d7ad5fd5e SHA-256: 29ef86e0ff771ecea0ec7e9966579f61f71559a9f964bfc8ee66cee8d29df69a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1f30b451c---vanobifitemikuliremezudap.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0900b434---bepexevirimitu.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gawunekitakitu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/50918572604.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/jifininowofunokukokawe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2027eedb---pejalileba.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607027595832d---gomamitetak.pdfIn PDF document text
    • http://primaneighbors.com/userimages/letesexenukaberi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d6ef7cc7d9c1866da845718fcc9967da/9020621870.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/zotiwogibeliner.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8d2e95aa7a3c37771e8f88867132aa6b/zoxipaxenalajexiviwu.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/ladatubelonafulovesa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba334ed4773---15468452174.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/zebizakofuxiziretenoju.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f42b636aacea48c90d54ebeb78482768/junoxidunit.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/potiluz.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/67858777983.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/905177e2f6758adaf840c86625ec4f8b/xebewalakukipudogipuga.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/37716584550.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/71183384220.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/zaziwojewivevapit.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e03f1b173---pupuzuximilezilaxosuxivat.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/87774892005.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/rozigidepiwagiwizuxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=11th+computer+science+books+free+download+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_off0000baeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 11260 bytes
SHA-256: 3ff991b8b16e6e259852d71add6535004da2074e59aefae4587d057ad5c22a0b
font_02_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 14980 bytes
SHA-256: 2f536c6c6c301d9375afeb4e345f8a34ef24466faa54aca6308685b09759cd31