Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c122b6690a844d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 04:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30c05871f0d2862fe4ff3cab9d7e720f SHA-1: c3dd1b859722f87cf72be10ee1e5d70100994fc2 SHA-256: 17c122b6690a844d43b62d6821bbe1db29085fbf72b9233d9e25ff5417b45cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=android+email+push+notifications PDF link annotation
    • http://marjoleintje.nl/include/userfiles/zitokopiwuzizuvatatalu.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/38559151564.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xepuw.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18034d101d4a40dd7f078126288d5863/zajinizebibuvuzunit.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/68598595612.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/xovewuwozisepopinut.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/46733483759.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/41263569334.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/94940756555.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dojuguvonowenululexusaja.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/33425528545.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/57323097697.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-4/20210904045332845975.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918a5824b5---88373457025.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/82312866347.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/85059281610.pdfIn PDF document text
    • https://quizai.com/uploads/files/74666296291.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/56291696037.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03e40132d---lunubisi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/54336213403.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xopawejo.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/54205049299.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/pedamimixizusorizomezoxib.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/020939253443.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/bojilito.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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 10964 bytes
SHA-256: 649ab0615c3d86303fa11ac9515995b5dc7309b06639c264eb06a78f3566b4e0
font_01_sfnt_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 15324 bytes
SHA-256: 11ce90f59d9107174db3cb01e89e521df32b8e4e676038b84c61bf88120b4a28
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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