Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ca10b6f48827f7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 08:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d05fc85b85b1dd88e6be9a397cef37b SHA-1: 26ab61e39713c08ea7582febaf940e4861f9f0d9 SHA-256: a3ca10b6f48827f727fe55d1f6747e0e6c6e9463fef2e8e78694cc48441b9ed8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=sailor+moon+drops+game PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145429d4c03a---79110063734.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210909020528.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/bopananuvonipodedagefijev.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/74661369938.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/mozape.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/9916146326.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161451396e0d6a---94477307552.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/wogaj.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/65722923936.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc8b6a1c3e5406daddc9b904cbf9dfbb/80071348708.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wosimi.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/geloboxatilumuwefemotufuv.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090523545839.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/55bd6c497ddf4e9aa533630350f72adc/57692087967.pdfIn PDF document text
    • http://dytac.hk/userfiles/kakobejixinitelofogegopek.pdfIn PDF document text
    • https://tarsiman.ee/files/file/736725339.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/71247633275.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/wexegujigikutobozilixep.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eb2447421e56e06d5960dfe1d887861b/19767345158.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf7218429---togifuxedaxulipupivu.pdfIn PDF document text
    • http://royalgroup.at/tmp/43402287798.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71423901967.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fb9402d5ceb3a950cacf807c235db559/64014435053.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109011136349648.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091518083873499.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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 10712 bytes
SHA-256: 295537e7a613e73c0d48fd5629b90ef51c27d4a239bf2b3598a65e6a631bb4c0
font_01_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 14532 bytes
SHA-256: 351ecd934ef24758516c715244390fd73f766f332f68ed27f2834f8471e6e46a
font_02_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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