Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1883a18c3f04da0…

MALICIOUS

PDF

89.0 KB Created: 2021-08-22 02:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0955158ff915b6e12ec6f394000bf1a7 SHA-1: 3d95c92bd9b602cdc6415cb4841ba4d5f668b42e SHA-256: c1883a18c3f04da0df2cc22da4937ddc4f6402061ab46ae6872070ec46b79627
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the presence of numerous external links and the 'ML_NYX_PDF_MALICIOUS' heuristic indicate a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fed1d643f3bbeb2ef9e529cad3484d7/30716659678.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084beeca0b93---ferumanaxepol.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/34023925589.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/93288308807.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf07401f8---48370413545.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6128a9221a51b8bebc53c14c0079a95f/97975191862.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/51035975587.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/gupebiwepivepanawiverak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/88264d028168bb4c0d8588b8e7a9b957/widofipilopavetutapuwisuz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6135cb728f6db1bcfba39aaa7ecfaf57/remitogoxuvoxedanurigutob.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2d4d092938ef24f532ff269c59282f06/mumutepuzes.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fipuwutofufajujugamidap.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/vigukexife.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/vomusuxid.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/37717989002.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/l2hu731rio2uferf1kt1le4jnn/luzotigav.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087987bccbbe---74025468891.pdfIn PDF document text
    • https://andrejc.si/files/file/xiferoletu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082770291eb9---zolironuzaj.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b184075c---vawakoxegikif.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051920081073499.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///16678223087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fm+whatsapp+2+apk+download+2020PDF 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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 17460 bytes
SHA-256: a1b137981bbef284af20911290b946bd37a62d34166c6cae4ce317d2eeec03d6
font_01_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 10728 bytes
SHA-256: 27964c3348cbd0c2c8fce4b9cc976cc9c11b1bc4d0f3e1d961df840ea0e3d9dc

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