Malicious PDF — malware analysis report

Static analysis result for SHA-256 2832d50519b945f8…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 05:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fb142adf23c37f490517a9a7b960efb SHA-1: 31dd6b68312ba5b8bb44d8b33334a4afb8b2179a SHA-256: 2832d50519b945f83070f654512c04749747b6136eea3713797b5048fb07489d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised websites and disposable hosting, likely to facilitate the download of further malicious content. The embedded URLs and the use of compromised CMS uploads suggest an attempt to disguise malicious links and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dc9a4447f282e1e8180491934f7eee3b/21625622599.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269b78bfd7---nesoraku.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/572be62fcea3093419126fee3b949d15/tibofatutuvepuf.pdfIn PDF document text
    • https://alutat.com/data/file/kewelibojudimivapob.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0c0d565d---31857980528.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/nunonikak.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64b37ea7c---xazubatejefavaz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7b671b32e5163eb7eeda9f3668ac86c0/tosogep.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/58190257354.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/56329591546.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cjha9p2hhg2p01osev8fcfq1j1/xowubajumevaxupifupozas.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/bowobodazuvotara.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b66d8e4a7---68359261710.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/botipin.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060318372063.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d60ddc4a---xizudisijax.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/40f6cf37137ef479f1317276a126d491/zurovadeketopiwinofebex.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/k7kqno87rk22a5cc9tvhrbb2p7/18535535651.pdfIn PDF document text
    • http://bakoca.hu/files/file/nipipawududap.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/buzigodisanalutuxura.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/74261699282.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48832373803.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/nokurar.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/botiwenox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=office+2019+professional+plus+free+activationPDF 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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 11124 bytes
SHA-256: b13e10badeeef5ba043a3617b41d1bfbbc69c15e546f50f5e4627e16f3b6683b
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16652 bytes
SHA-256: 1523e9b5aa9afdb1b842ef74562e96b6d3fbc29f70dab9883f0a25c01a1ee118