Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4e3792fa196848…

MALICIOUS

PDF

65.8 KB Created: 2021-06-23 05:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dfb2186e10bd583b301c857801b09830 SHA-1: 9b3f9058097a58387e439adf413ca186494fc280 SHA-256: 7d4e3792fa196848928adb3a6309891aa0355f65d5fe51c2be0f3e7df89df9ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://audit-advisers.com/userfiles/file/lavosumewerum.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/vezatexovivegudigurej.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d9d3515475dde2558e643bb80d572c9/67250023151.pdfIn PDF document text
    • http://goref.ru/files/file/zogerenusixuselisunilexu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160963d4def320---wokoxoxapined.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ve85g07rlccdcrgke3s1qjovai/jemavibizimet.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160772e6974259---sobukumodeg.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/92248550138.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/njcgfsts3364hjr1p03g78r7vq/jebidaji.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/werigamidono.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qsermc0a8uij0ujva2cd0n4ni7/48133156929.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vunotutaloziputek.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/91770fc0ba8a7cdf9d05c1debb68dd10/pirodasuze.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9413ec8d---likikurasumovosu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/kadivedoxesis.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vofuxonapupuwun.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/33759204557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+clue+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 4912 bytes
SHA-256: 6f50f99fb2ccd91c7cf9deb7ff9567dab16bedba3a31d3a2e4053b36a305c870
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10776 bytes
SHA-256: 4315da87f1cec584e09e0f0bd7e783914cae81a6d0ff071a2d01429ecafb63d7