Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4f41ba88dc678e…

MALICIOUS

PDF

80.4 KB Created: 2021-08-26 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 554d4ccd9f9f152ee4ad1d282ad3bad9 SHA-1: e1f7dd6bab10858238fb5899d5782f328464c1a7 SHA-256: 7e4f41ba88dc678e8bd55b4028994efb2d68ee611443d4f884cf6980ea8388bd
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress upload directories and other domains, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, likely to lure users to malicious sites for phishing or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the link farm and potential tracking/phishing nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 https://oniceh.ru/uplcv?utm_term=what+is+better+blue+screen+or+green+screen PDF link annotation
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/vofosodegoparaze.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081d777e79d1---31424857752.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ea0cf4a---54099750389.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ee586f68---16246300747.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wenutoji.pdfIn PDF document text
    • https://shopabrang.com/images/files/91227346699.pdfIn PDF document text
    • http://salespate.com/userfiles/file/54201749628.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/25725540041.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dde7983b---vonipajugawexotudewig.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/mofidegukijo.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rexirakapu.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210719233610.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608539eb29218---zozeluguwudu.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/zivin.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4256cd888442e0ad2a964da76f7a1bfe/xujenikogunixi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kvsjjr6hbuamm7ilh82638dsu2/disomatonaxagowasezatut.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/befazopomed.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/28128688719.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803ab4a53---gudopu.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fixurowilunupuj.pdfIn PDF document text
    • 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10740 bytes
SHA-256: 7cb811a77b53a280ff8b31c5c87a4eaa4ab2e10c1baf15943af04e3dba585cee
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16364 bytes
SHA-256: 922af9b08fede4e7a997373d29d4a76b34abf6617bb8e99586b339589f158e3a
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1