Malicious PDF — malware analysis report

Static analysis result for SHA-256 997f3ed03115fecf…

MALICIOUS

PDF

79.4 KB Created: 2021-07-06 10:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 769c793032ce88263b77c81a145897ff SHA-1: 3a5d409b35141fe260cbe30701ec7c758337ba6a SHA-256: 997f3ed03115fecf40fa81ffce37cb43dc1d5361f503f22b0b4d7c8f600f9b11
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to potentially malicious or compromised domains supports the classification as a phishing or malware lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/552e0c326b75513ba9e7e28e426c544d/godalijefupimozirapep.pdf In PDF document text
    • http://navigator-nsk.ru/userfiles/file/miwebimatusiwotote.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a97f1cffea7cbc655d7c63f7c15988f9/wasoleseburirop.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/463ca18dd1a80370b6e9778e360d1e77/23756497871.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/03hj9u553dhpv9d7naj4ta5d9c/vexipafodajo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/74639102542.pdfIn PDF document text
    • http://jkohut.pl/file/wubidigelasu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f84bcfa21---20402408622.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/87f7914692e55f6acede11573cea2301/93604094030.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f634fb83---95764913451.pdfIn PDF document text
    • https://tonitomov.com/picture/file/medodatuvodolebujipeza.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/mutewegisetob.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/85455526497.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f1d9e6524---18356780090.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/40hee78o61n7i7qde7vr8b7697/83024176920.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nofiduleta.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a334988135e---bexoledabaraxenepum.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/garoforafus.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/lunovepawomusokixok.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/webop.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84250794133.pdfIn PDF document text
    • http://goref.ru/files/file/51499276933.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092737697595---94093032340.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/edea583719125c0062591c8bd2c1f3f5/44633241926.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ba837f04---minasez.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b3028f297966c45ca6fbb06cad209c98/91746033587.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4rgg7gtnjefhq1t3e9ko1h5bv3/82372575349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sony+audio+system+manualPDF 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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10596 bytes
SHA-256: 3e931f899735ccbbb49224187bfe8dde58cc2772d539f87d425ead2c5b1c1a1a
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16328 bytes
SHA-256: 67b1f36e61aa6ddd6dbef142ef820cd05ad368c26dd960fb825fbfbf57dd67d8