Malicious PDF — malware analysis report

Static analysis result for SHA-256 108e95b5ca6166dd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4e55e23eb730f8f18f6d65c480d03007 SHA-1: 4da82cf4563bb9f10e8490b8d074c07eadcfa5dd SHA-256: 108e95b5ca6166dd26c83903aaaef99b1d5b07952c375f37562be8a12ddb510f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eec8cb867de8e841ca4a2ded0c5ed689/26107758732.pdf In PDF document text
    • https://villamishkan.com/310renonew/front/images/files/rulasunuxotomati.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/kilirugexovosizoxibogij.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/95556364601.pdfIn PDF document text
    • http://citra.cl/userfiles/file/44299918016.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/16703655036.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/99311200703.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/nowafumorimodorefezuponuk.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16138632f14009---44819314864.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xavirerupo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381aae5e26f---83463728923.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138173ab7a47---kakukolozagufemetu.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/zemovabelolewabamezokok.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/momugowu.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/24300628774.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/roripokuropofikukogobow.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/rimizavedigoxubonomakog.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/30822190678.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/34833748945.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/wuliwobake.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rikasodazisedotil.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/62357763805.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/69128937233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apa+manual+citation+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_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 17992 bytes
SHA-256: f5f0ff7c2257b08891f45d17e9d7c485480a4f31d35e3f48e21d38823aefc811
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 10448 bytes
SHA-256: fb01c9553d04351d52c087bc50ee82f176976b3b336bab8a6776225c15ccc5e9

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