Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dce1c8442a66e3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-26 16:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 437d53673f12aa3a3674f25573056e6e SHA-1: f23ba6b168323233c93b08fbb50c777eb3a9df65 SHA-256: 91dce1c8442a66e3bd6c06271cac2c4760e6922bb5dbc9dbba97bda36e938e83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Blocking

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm or phishing campaign. Crucially, it includes an instruction to disable security software, indicating an attempt to bypass defenses and likely facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160729ba836d29---19042591919.pdf In PDF document text
    • http://health-bridge.in/upload/file/18854122171.pdfIn PDF document text
    • https://faceless.me/userfiles/files/27939549584.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084c17234ca0---76926721119.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/2f4aaaa7a9a48ada6c356e1522555cec/25288874851.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nesodesatejawipexo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160da94bef2727---kapupiruruxudevu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f7693be65---34711472874.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/917f5fa0c6ba43fadd33fa977d6367e5/nusevuxipatopusosibu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d37479db---gidaxuguvivewudasi.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wezenomagivuxuj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c6305808---bawobuk.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6ckodg68b2argnb3o5qj4u9agf84g0qe/xaxujipoxapibipuj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/berqlg3hsrkqmgqf3d0atoaqun/17888826776.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/54824835101.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/21226677697.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/rovujigupamofadajugo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/43030068065.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/28248886422.pdfIn PDF document text
    • http://darec.sk/files/files/xogimeg.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e4c4747d7---tisesodulemaruravofozepu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/wepafapu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785360d639a---bimaweviviluvipivimabud.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091276b6c12e---52859384218.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/musesoj.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/84812542426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+get+gta+5+rp+on+xbox+onePDF 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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 17188 bytes
SHA-256: cc016f8db817fb3d865cb6d6efe61406b550253729951800b0a054bea50a01ed
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10744 bytes
SHA-256: 89fa800e953580784bc8846d7edcd5e0e523ba6ba18b513ee45b78e51d30836e
font_02_sfnt_off00013e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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