Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f41311e24ba9dc…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 16:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cdbe9c932bef5ebc987834b2ef0fd82a SHA-1: bb1f8c296b8c3f9545dbc94b9fae34027e47a21c SHA-256: 83f41311e24ba9dcdbaf8db08437e542ec463bd6ee27b35fa3f10ed1ac3ebb20
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. Heuristics indicate the PDF is a link farm and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=balancing+equations+questions+for+class+7 PDF link annotation
    • https://yapluka-services.fr/userfiles/file/55573069378.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/79354041905.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kisaxexudufug.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090714480373499.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/48813170753.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69166893008.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fatetunogire.pdfIn PDF document text
    • https://pcetravel.com/files/file/pivuri.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/xosilolidu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e408280e5---xorifiruxox.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/fixatama.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/95729273286.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/notusofabuvinatudofawud.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210916_94886AB5586DDCC6.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/35972258998.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905215413.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/jizetozuremamo.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zedokiralezokiforodazuxe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a411153b0e7ba779bb58694fb42514a0/befefesiremeza.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/81000165639.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xajalitewidazup.pdfIn PDF document text
    • http://artospace.com/pics/file/74850006996.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa92f913713f2bf579e07b6428ed4dab/92410406404.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dutipasomegapibi.pdfIn PDF document text
    • 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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10860 bytes
SHA-256: e08d8439a76c0f68a4d9a1b5324e26270cfc76975ed713686f0628db85540ece
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 18212 bytes
SHA-256: 6b38ddaf7b458d7bd3165cee904fa976f29669436719205010977d2846b81e94