Malicious PDF — malware analysis report

Static analysis result for SHA-256 8879c24425ffa568…

MALICIOUS

PDF

86.4 KB Created: 2021-07-10 05:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc296bfe01af1b3c311771c31db1dd2a SHA-1: ff855055c57df6edb49447b695970bd790aa83a0 SHA-256: 8879c24425ffa56802ff3c6c883edf45e7d670f9707480f12f25623fffe2c99a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory, suggesting it's part of a link farm designed to distribute malicious content. The presence of external URIs and the IP literal in one of the links indicates attempts to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02b92b0e2---wuripozilebunokerezuzefol.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4u8dncstc9ji01djqsl81nog22/xemamewejofobipojaviroli.pdfIn PDF document text
    • https://songhong.info/userfiles/file/69139227065.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d8ca14fb172b6a8cce12c123df04acdb/51425509262.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741b0d4d1a3---bazutov.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d0029096---pefusezosenesozozogovaj.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430143230571242.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/vuzopevapoxuru.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/24953683750.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/94506958051.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fe4bfb97b74a9a6bb8c195ba2b076958/11675334752.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bc483ef7---zilipexadufozuvojo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/85680231928.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b78a1da3e---13934599935.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pmb1rut57j3t6ioe0gbg3ofnau/xudekaxumat.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/56438939277.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ffc9642a9ae91f0a100920a243f9f77/29697417849.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/zonebesivutimezazariwanam.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p21p1sgd9ss3b3fk5166fhknm1/gosujapo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae2e1a574929d3e9bac34474e1db4447/51667148856.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d35a67bde60---bijavesexolalaze.pdfPDF link annotation
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n9v0aj2rittv3annv64hv5d81g/jedavuz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1610487d4a---suzusulomasusej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=past+perfect+tense+afterPDF 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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16716 bytes
SHA-256: cca9d67a81fd239469565a8626627701fe63aebc23ee2fa6f6e26285dd605699
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10216 bytes
SHA-256: 6523f4501d2c01753331613a7ce2f699dfe76c521d705664ea57f9d9846ca5ff
font_02_sfnt_off0001345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1