Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ebb25606698e87…

MALICIOUS

PDF

83.1 KB Created: 2021-07-20 20:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a0f3f97ab9798ddda35238acdab09b5f SHA-1: eb9cd6f6369b7ebacdb79fc42cf54c702fa4056e SHA-256: 41ebb25606698e876bc562b3be246f276f6131527cc330050eeca124becb75f5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4342db8dd1b18e2a91318c90d5a94263/muvonabomexefenejakize.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4ebde2f431d1b7376e13c1657fcc125c/47527772859.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/tetepikilanuvok.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tevufazemilurudiguxul.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/47b3388e5b05525a477ddd4009581444/kexakakunikawikepuvewof.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/68274251779.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/sumevotagesa.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/pozurasanaredifelipa.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/bujanagufusadiwolotime.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sisotovujafemiduwi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/71277771928.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/58a333221f3171de534153793a97a518/51669668346.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/29064681899.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42266157455.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wikokes.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/7368212613.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/mojivonamipivixikal.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3tlnh2aeerugqilismp9catqg0/25952127684.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838fe65dfa3---marivofivakevagijutul.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc8942a56---zuxizejamugolokuz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3rsunsk2amrg44fi19ua1q2k5/94034529432.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16209658995244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mole+fraction+examplePDF 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 10568 bytes
SHA-256: 5d3f5edfe379afbe6201646c1e51f7a54cc4d6ea7f4052f8398009671c5dc3c5
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 17308 bytes
SHA-256: b67f89d097a5c1ceda440beee5e6949c14c700d07d673a90e0015d8bf7f8f64e

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