Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef604427b64afb53…

MALICIOUS

PDF

90.2 KB Created: 2021-08-14 21:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea8ccb8f331058a7413603f439de6240 SHA-1: 59eb0c152de99c0dfda8814fbb7d638160947ae0 SHA-256: ef604427b64afb5399607d269bd7b1bdc1e6c0ebd546f42b1ef8ba7a764aa325
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=new+hollywood+movie+in+hindi+dubbed+2020+download+filmywap PDF link annotation
    • https://dolmalatrek.com/userfiles/file/64291901369.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c552efeb9e3---64986516889.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/09d8a4d86d101446e6475a2d8ee19f2d/jixobifixemu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3ab66e78901ce253da2c9193134ac4b0/16235576954.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/duzevurosejedanu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108865516610---33239167155.pdfIn PDF document text
    • https://mavibusiness.it/file/3861219054.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/98965483091.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625267033.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f44e9a75c1d---gafurama.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd836df70c.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/51468961655.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/memukixuka.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/xukemek.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/931b59739e3105d87655c6ee80de931a/kamofi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/8741413983.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/396d67e5b79a751877ecb10c8f4afd5c/zogedimonusamote.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba9ad7c9c---modusozarefurosikaletuvoj.pdfIn PDF document text
    • https://rosycaffe.com/file/nezononiliwopuxatenumalut.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v9056r7pc32jg490mnjjddchce/89570916490.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a452c7595---28981311257.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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11120 bytes
SHA-256: 6bd8964132dc8f5aaae971fe2c3985b9b182d7cb0ba93df88734a42d45467ee1
font_01_sfnt_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 17268 bytes
SHA-256: 722f32d2aab57e26ad5f1f44ca7e97baacf0828d91d457f657eb80501abaac52
font_02_sfnt_off000142b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1