Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1993b1b72e02485…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 02:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcef2f64cea11374e11f1628a25eb85e SHA-1: ba023b7978354252307b16687cdf58ae1bf2190f SHA-256: b1993b1b72e0248558634090396cf48da1ca959121fba7ee09bcba6a4e098ae0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

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.
  • 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=dell+monitor+model+2407wfp+manual PDF link annotation
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ceb4f4ec021ce0e827c71942904ac1a0/51791445132.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5d3640714f9d948e4c2317e04ec1be2d/4338032738.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fc5f47f40979aa40f0353c6e0dedaa2b/sirusijulinulalovejeneji.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/vuxarikower.pdfIn PDF document text
    • https://asi-filter.pl/files/file/tixem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4f3bfa0d95a8d6830ee118b190d8484f/91670991936.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/43421815656.pdfIn PDF document text
    • https://bloc-immo.com/images/14899352781.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/ziwuguwujeze.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7658cfd9002ba55bc13d23e804363afe/71580463849.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e9182002---revuzejozokibapizimefew.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513ece57c6---keworoguvetetuw.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0910b9e4---jivivipetiwuxubemefo.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/fogejademinu.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/zuviwaxukosisamexeru.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c13201a6db8d277164783632c38bb3d/72726933422.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ha8mnkuo99fq4uvk1rbhchgm9s/bonogekisetewomafizat.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/polekaked.pdfIn PDF document text
    • https://mcsfood.com/images/file/61304830890.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lemuradexup.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/73385401d6b7a1d0a83c3431aa959f78/44235197320.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca01c440e---80019309058.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8co1g8rnjavufqp3mthho84vbm/pevebane.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 11048 bytes
SHA-256: c1e05640aa5c2775e178083de78a9aa12177d1bee1904cb713c0fd253b5bc7e0
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 18316 bytes
SHA-256: 280ca771697c99eff33c0ea5a245b4f8e43e643fa1bf2068949230da6fc1c78c
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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