Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfd492ac3802be6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fda5bbe5db9d29bbf1bc153ff0e99c59 SHA-1: 3cd5089a43bf08e90a22d7582e30b431dd233184 SHA-256: 7dfd492ac3802be6ef00f27ad01335f6efb8ef4947b442d6e74a594179933c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=email+for+attaching+resume PDF link annotation
    • http://nataliashishkina.com/userfiles/file/padakoreroze.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/lunite.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mexosakomerosu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0ad594bd---xonisirulamu.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/vovamemijopasogone.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910101121.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/3894618478.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/42749929652.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/7201367260.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/xizip.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdfIn PDF document text
    • https://deepex.hu/hirek/files/vusujirivevawebimifevuva.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/71106513746.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/gefuvefunuveziroxidubu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dfb17697ff84bf15c651fd4c7a4f36af/jaxidodezaxadeliberipa.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xuzanoxogaposemi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130494c767a3---61458483613.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wasapijepetiru.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/15551984249.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dpvmn1j7tsj70odn3u355vjgk5/tozuw.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/82686756887.pdfIn PDF document text
    • http://forum-auto.ru/data/files/41058562566.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10868 bytes
SHA-256: 5bbe422aa72391ce041c1f866a989944b4586d649313fc05eff2982d7e5a0943
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 18688 bytes
SHA-256: c14a8ba74426d730e82497d75c6420075145f52e14410d76cdd1d12424bef7f6