Malicious PDF — malware analysis report

Static analysis result for SHA-256 b839284dc4d3dd2b…

MALICIOUS

PDF

89.5 KB Created: 2021-07-16 15:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bb330271c8b21e37318258a32b3500c SHA-1: 3439906c0d36710c95220ec86c63f881d3d03f39 SHA-256: b839284dc4d3dd2bba253dcfda3097fecdb90f7c2edb7dcff0af23f684ef9228
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2f1b0cf07be91c1d483af5f0ee38c659/69820159950.pdf
    • http://unseenadventure.com/userfiles/file/rubuxegewipoxiwuwodazijax.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vulipikafarirasemajozev.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2568e43dab---tanorajikobukopaz.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/34125073259.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e212db46---vujov.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ce51292a12091e458636be5ab5e6842b/53412785487.pdf
    • http://afgventuregroup.com/cfiles/file/dodogexebofosamirowudeme.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e68f25cbf---dugogejeg.pdf
    • http://yilip.net/userData/board/file/luvopolosajumurekuparixi.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57968cf97---1776700070.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88304d006---sodezovutefitopom.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210627_5E4C257ADEE5B533.pdf
    • http://afra24.com/basefile/afra24/files/biriravamojuferebenuzo.pdf
    • https://anandamsanyal.com/userfiles/file/paralidowuxigofaxem.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0d38e4aaed450c70dedfb4eda48a220d/foxabitewozenuju.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/tujazowid.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608551c46bbde---79553564469.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d9bbbf4f1c1f4a56190c2ef46992d4b1/jofatitu.pdf
    • http://gyobel.itpublic/file/zimalulowefodawexedobutaf.pdf
    • http://wsystem.sk/userfiles/files/vokamimuni.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9f0a966c---vesesetinibonu.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598a3e1c87---vexufapepalutajipafisur.pdf
    • https://triosms.com/userfiles/file/puxagefa.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210530211010.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7acfd9d6d---sigalufopanibomawumudo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=common+homeopathic+remedies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb90.bin
df896f832cda1a1ba7f0b8f89af50345b406a51f4c30ca9db7bf4ec48594161e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 10764 bytes
font_01_sfnt_off00011427.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16792 bytes
font_02_sfnt_off00012c39.bin
b65ffe7b1cb16f3e2ecd180b47ba5a78653dfb962a27d7f7e6a2375b1b12dd5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 16944 bytes