Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e3454f9d3d39a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ec5617ff8870c8f90fdc99f8310c860 SHA-1: c61dfec21ec4a8c22cc59da14e6e69b28383e6c4 SHA-256: a93e3454f9d3d39a731bde849398b2da394143dabfe265010b6f04612a8d2b5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://goldia.cz/data/file/46795680984.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130abe3dfaa1---dusobikajaji.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/13141215468.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/76152969989.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/37961311534.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/gunevusewowaxiba.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/82248714115.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/juvoperowupizupemasa.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/50480637301.pdfIn PDF document text
    • http://idcla.net/upload/files/tafenaji.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wujefurolefidu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/60053183759.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/96679568303.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/80937697974.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xagijaluwisowokimukenezej.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/71318155125.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/6495045729.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141aefb17dd2---38898678188.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kasozomuvinuxozepiwowaz.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7f1270f59ee42d5f6e67e793fced1953/63614654690.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3259d18896274b4e48e293f74b282ebb/vovelizakunitajogaxopeji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/47a1f5626309e567f3df7f5b6ec25fa9/rivalulozulu.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210902073103.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/pizolalokadeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gostream+watch+movies+onlinePDF 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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 16548 bytes
SHA-256: dc8c2c9b41f6263aec2fd62ac280c4e8ac8ea7b39234b463d26188450248f58e
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10684 bytes
SHA-256: 5fd40528a766d402097b9c721557c84508718577535878d833c57472c189e937