Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffab3d4b634d1e7d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8cfdad0eab100024f6ccbb3c1df968d SHA-1: 3729543e86f9c5c38a2a33811a6b3f5df18a7d0a SHA-256: ffab3d4b634d1e7d9f38f569ac74e12cf8935eff4a6d2552c369ca1c27fb7c13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of JavaScript points to T1059.007, and the overall nature of exploiting a document to lead to external sites aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://crysiq.ru/uplcv?utm_term=most+common+phrasal+verbs+in+english PDF link annotation
    • http://archbot.pl/files/file/nefidek.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/funadumokunuginekelafopi.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/20300238590.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/kudoniguribopegubapizikid.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/wirugavimi.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/29232710504.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cn2kub7ahpqtvueq2kk7o6j6l9/37864100496.pdfIn PDF document text
    • https://clubon.top/uploads/files/rusugen.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/72071329297.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/5548527080.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/nasizimarun.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991cd782f7---77767965155.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210914075611.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/pogugo.pdfIn PDF document text
    • http://unibox.lv/files/text/kabexibap.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/nabodorudolebufajo.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/nafolaxapawilawuxenokog.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e815d62ca---gofirokobaboz.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/70444589310.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/67943609719.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/niwazar.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906042027905.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wipaxazavaragomalaruzin.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 11020 bytes
SHA-256: 6097933cb03bd14f069a1e54d8ee23f52f9c7a2c826abff542a75cd8cd2b3e26
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 16572 bytes
SHA-256: 84460d664fbbd4f7c25bf937cb46a6a6a0e38247aecca9f4c0cdd0fd8577e0f5

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