Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ed7af8280a358a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ef01a2fef15c1630629fd169d543ab2 SHA-1: 5a2704f3133d9df4ef93f85872ba752921e8e33e SHA-256: b7ed7af8280a358acb29f3fb09bccc1a3b8c93b1042a320771be762134edb6ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The embedded URLs suggest an attempt to lure users into clicking through to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://doubles301.jp/files/ckeditor/files/64508694957.pdf In PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/sunenujuko.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43491288418.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f3587c8bd---59936523927.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/53191939606.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/22369634693.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/rokosugawunoguvigunoj.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/15925683628.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/21966749645.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/16755950163.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///fefetawu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bca7211230---wixusobivemamaguzivalufe.pdfIn PDF document text
    • https://medpressa.ru/files/file/65169591889.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c023be449b2---katepenalexaraxebenorit.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c46f0295f6f143a1082f87fa83470ae3/jiguvokigijunegipojunexen.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf0ec99450862f4123b5f9767c33fa7e/42881547302.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pkvg406pg074v6vv5s0huaghkd/87844133535.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bb85954e22bc9ab7622ddb55ef37b0d5/57827871350.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/66172bc3565db9900b45f10b3267776a/80113993993.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/serezi.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/wutakilonew.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/12016229641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=elkay+lzstl8wssp+manualPDF 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_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 10612 bytes
SHA-256: f2226970b16393a1e663a25240914f957643927dd8c18b756522d6d522e4450f
font_01_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 18316 bytes
SHA-256: 7c50c3e4a1e10ec52e3e941e2133b51057e98f4b64f3bce6dee0f75624c0140e

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