Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d970d25310ff132…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 02:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f16fe77ff280525f442e8db48d42aa10 SHA-1: b6ba435e6a7dae6200f52ea6a53a3d5769a7e4c8 SHA-256: 2d970d25310ff132ccee4a8d474654befd2e1af8ae57940c9215f5abda060d86
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cbafjvn.com/uploads/userfiles/file/patuwotuxivukepo.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b756135d05704045e8b02632488e6446/96441464251.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/45024005712.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kubadiketekov.pdfIn PDF document text
    • https://airbays.com/userfiles/file/24627694358.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dopawepokosowowelisabep.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/pobokizida.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/56610061743.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-23/20210923195851424420.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/sidubosoberubuw.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/simorolufoj.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091521291323.pdfIn PDF document text
    • https://cardolf.ro/files/befozuwuma.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e357656fa---55477903142.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210909_181434.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/71550362455.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/newubenekuko.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5309105d---25305660063.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/55460038624.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/gepagonowesunef.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/42323935013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nba+2j+locker+codesPDF 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_off0000ad75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD75 15732 bytes
SHA-256: 049f476e926cd29791c21dc2376c88fd5340434f9e312569b6e3a5e4790c54e8
font_01_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 10528 bytes
SHA-256: 52fe92623f239f5ba753e2ac2921f94176016b4fa83e46603eed7faabf98db1b
font_02_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1