Malicious PDF — malware analysis report

Static analysis result for SHA-256 9077e89a87a09c38…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 13:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdf4c39bb4cf8688c5acefa9185e20df SHA-1: af70935bec63e06d620b84be0b86d5de83d9cef7 SHA-256: 9077e89a87a09c389e6108f0eab0c1b830992eb47dbd26b24303127d389bbf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a multi-stage attack. No scripts were extracted, but the PDF structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://krr-nfe.com/suratnfe/UserFiles/File/dikutapiselopalo.pdf In PDF document text
    • https://halkum.rs/files/10184926543.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/33988651745.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/waxajelomo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/11600353351.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161371e5539921---zazoposipivokatowepig.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/rafiwadowanavewevebam.pdfIn PDF document text
    • http://bdsductri.com/upload/files/59301703523.pdfIn PDF document text
    • http://4rrecycle.com/files/file/davuwofofugojutom.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/85708955074.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091219585121.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tipubipibopuvixa.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/5520367695.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sauep2kjrprfr7ftaq2qrcme12/99880079561.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/832a52ead9e18d0319f49885a1c560a0/27657992135.pdfIn PDF document text
    • https://efnnma.org/files/file/38804526866.pdfIn PDF document text
    • http://dsraxys.com/uploads/68611820820.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ced693d17---zobawolufosupaf.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/18513617357.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133412c2c687---farutesubanevajugu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/wejanafosivuvibaxonevi.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/49369862521.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/30019573451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stream+snyder+cut+freePDF 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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 19988 bytes
SHA-256: a787196466ed9f11dd7dd5a93a66f8ef7b93c75e700c8ab032be8b6d8da89a76
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 10668 bytes
SHA-256: db2bcf5c53689b38cad01fbd2bd62c6d0e8205be29d0d102b8b12c64c70e43e5

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