Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4d1b134faf0fc2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 13:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b519aff14b7f638e97e9f63e86c6b67 SHA-1: f3da51c26f00863e741eab5de54565a14f8a2f22 SHA-256: 7b4d1b134faf0fc2294aacde4b32591970b73c9b0fe437d30be41309363d4fa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://eirai.org/editor/ckfinder/userfiles/files/5147545923.pdf In PDF document text
    • http://lifeline-sports.com/files/file/wigevefum.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/julutinazu.pdfIn PDF document text
    • http://houselandia.ru/files/monawalukobobuja.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f4298a3ebc0fb19061e1e5ab5d3e3e23/43915503271.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/lexizewiporixuwiwozezuk.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/89545627576.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/gatomoniper.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/21174840818.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wajasapiwujirazawux.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/95253671975.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090512364873499.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/43900593503.pdfIn PDF document text
    • http://land89.com/ckupload/files/73795075838.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/af02a9b3dc0ae6cd5151131e9934be57/gugezilupugadexusilolafa.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/78221877593.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/41828650605.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37876315056.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7229b2d76---39837225042.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133726ed94b8---tatelufag.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b972c81a5a---85984292752.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daronifimufowaxakajakig.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/50748866474.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/simumufapuroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=impossible+snake+2PDF 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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 17528 bytes
SHA-256: 2955e4d7bb8bda01210e4dbdd7535a9fb5d157c721cb14d3275bc2f940441093
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10516 bytes
SHA-256: 150b0fde5d16651c99e0605775beddc5637c75f828a50385c26309cfd3fe42fb
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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