Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a90802adb99b90b…

MALICIOUS

PDF

81.1 KB Created: 2021-08-20 17:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac36a7c9613c746ae959008a43df8050 SHA-1: 47cc4dad8cce9a3a6248f9aae0d936129156916b SHA-256: 7a90802adb99b90b9f52d6d27db2c2a9db6f2c264e6e737667c55e362c4818cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=how+to+get+spotify+premium+free+on+iphone+7 PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098af8fc7406---pumajekudefamabunuboxo.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/davupuzugabug.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/ferufer.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccd7279a0---muwezedamomodoletuvoro.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a02c4a28e---95637106417.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/2519713902.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/42357116244.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/evke3isoudhgbt051evs935bvk/23085591051.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9375814b---xapasazonabusuzuxol.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d8e9a34---62334519851.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210702_1BD3BA498950A8AF.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210517091539174303405.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b45ee7d0---jakaguk.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/ledig.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nonakawesivumigu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bodemumexuw.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zewivupatebetorideloru.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ebsmng0dj4dknj1fhmspimtmi0/23369961041.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0933562001621599575.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/62pslh0c2mggpau8gp3fjlbcl9/pexogaresorodumoforipeveb.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/25386332114.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/valox.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/22594077545.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dexuvitesisedumigo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fc571cad306fddddc77c60e84b813bf/mebunevuriranusename.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/27e07d9beb5f80b365ca4ef41758cebf/1968909561.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 17292 bytes
SHA-256: 2b794830e082a0f3f41de7627579320a5d010f7c40d205cbed20411ac84645b3
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10936 bytes
SHA-256: 83feadfd79f32abe768477ece18a4d46cf0aa4ffbc56e5ff52950789aef9fbb8

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