Malicious PDF — malware analysis report

Static analysis result for SHA-256 946b18315b4b9e55…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 03:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bdfd118311d8e793e10ce15e6d8816b SHA-1: 8a72630a6100ef13e5ed7dfc7b1f46c386b6787f SHA-256: 946b18315b4b9e5533b539a2160c2ce88c0934e1b1ef3e2589ea02e2ea2f9a24
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable domains, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://majorsagilekvaros.hu/uploads/file/tofofifizo.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc0720ca9---xawijelezekoretagenu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/35244703254.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/rexil.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/83646631885.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ae56301656f1a31f6f925f64a167d362/gijebapokuxenobez.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/smjo58bq2ecs509gj8vdcbn42b/wigitobivasusore.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2167ca39a4---balovad.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/laruw.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961cba1d1fa---89405032742.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ab64647cd0807b2ffe65513567f83320/fibufoxujugogubesebo.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/4619241739.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///tevugulemisonezibeve.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/k1tnnjqq0482isg47341gkjo0i/gipujufug.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/lodemekadifiruxez.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/76952235994.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086611109588---71820235983.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/lujitil.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kupomalopupepo.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/63596482377.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/95440675766.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/piwosafovewusamopazeg.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xulafubowoxanipe.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/48710932130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=loudspeaker+design+cookbook+espa%C3%B1ol+pdfPDF 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://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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 17232 bytes
SHA-256: 753e5c1b9d6c58d2d0df9ab51f0cac88d5efb55505e6c43a2c070c001660d3dd
font_02_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 11192 bytes
SHA-256: 976dccbc8966a6d857bae9f14b7792a0f5390c9006d86db2ffbb1f7578c0e22f

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