Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d322e3464b685f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 07:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c87b12530f00bd726e3942ec203f1b0 SHA-1: f673a5fdb7d5f3bbce0f8276c7f30b7193b3b871 SHA-256: 43d322e3464b685facbdeeee4d2b8631086c301fdfd834b9f4c9b3308a90a3cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of link farms on disposable hosting further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crewmak.ru/uplcv?utm_term=samoa+is+in+which+continent PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/682f4f3a903ad550baffee7fd875efba/66732500278.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/de543832101242a7623ca3c70d7f3ef2/93416558163.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f8b205d4---leluxivi.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/66068008492.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/81652175355.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/waladififorizuwukujali.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/52585141580.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607423400808a---ginedodi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/lovadunelanigajugujuw.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/23897989038.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/s19u24crvu1j31dp783ut37k25/mabamoxowosu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c7879867bca.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78b42316---gejew.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b5fd486c---74749371859.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22736140912.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/18962321816.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3d308e39318bb855114efdf9a8166752/5599273244.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32622747593.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f9fa9ecd---70686794266.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kewuxadoxugorodepuxibo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/35734413158.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/vavojokisojeb.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zisokusaz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f2a61737970ecf51ce5f386f6f11702f/91867221467.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/89194955365.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/4075019144.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kudisusofetotapof.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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 18400 bytes
SHA-256: aeff52aaad4ae322d071155db59fb5880e3ac09da35bee67bc3cc38aa65340c1
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 10512 bytes
SHA-256: d7ca8a93631ba0e3d4d31a8441c240800bcc7037e967f5bb8d60553ebcfb376f

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