Malicious PDF — malware analysis report

Static analysis result for SHA-256 352976a377b2c8d5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 01:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 283838fad0bb559a324ffed75020155c SHA-1: 94a63c730b1f09a11a85428b089cd26748678de2 SHA-256: 352976a377b2c8d5ac1c1e4ad6a941bb4194300ada65b35154092ca100cde51d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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, with multiple embedded URLs pointing to potentially compromised websites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdf In PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/68341932409.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/zufewewosekuj.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/saxetezokagawuje.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/mapuvaposodezepab.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xirebalikarogalixu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/54011258361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f17a20795---32206261384.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wawuvomakuzapegulijofora.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109131457586177.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/18758696721.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/levuvebuvepalebusujej.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/37452492279.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/94140713009.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lalirakoze.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/relufudejotimev.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/nefamodazimavagekol.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/xedufi.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/48911624386.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/63643490608.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed81e762---ravukefu.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75346510560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bach+prelude+in+c+minor+bwv+999+sheet+music+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 11496 bytes
SHA-256: 9222d99d580bef744d728d3f68570a70ca355293eda8ad395b86025cbf4f0898
font_01_sfnt_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 1884 bytes
SHA-256: 86f0349d8856d28c04ba828e05ac4776287c631a4461064e5ef01294f7eec0b1
font_02_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16772 bytes
SHA-256: 905bdcf08e20d3eb3c4c9c78864a6a54f2b07f4118307ececb876d0b8dda49cf
font_03_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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