Malicious PDF — malware analysis report

Static analysis result for SHA-256 7233e68ae7da0f1c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 01:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fbee3e0368ea9dfd0c6823d56fbbff9 SHA-1: 5c3c9d1adc0653614ab862d8e3c141e078d7b6f4 SHA-256: 7233e68ae7da0f1c82b37d34cbea3708598e3fe75be92e597b1709f727f7bbde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or potentially disposable hosting, suggesting a link farm or redirection scheme. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hjjqnu1rp7eb08bktuctgpdhc6/59567483521.pdf In PDF document text
    • https://eltdb.com/UserFiles/files/61010349516.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/50270939276.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/43638989982.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/33898035379.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/levijuvagedufut.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/26170589533.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6f907044---79927788893.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/34558763954.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e83df1370ab2db666fe4ac9f3681594c/kigipazida.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/25340149976.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/23719198758.pdfIn PDF document text
    • https://alpinashop.bg/files/85074358784.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630531314.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/58545172537.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/rejovexulelozejun.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/84750328912.pdfIn PDF document text
    • http://info56.ru/userfiles/file/11215716970.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/42882159212.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be0fe48918---guviruzigizamu.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/87029898762.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/39336583728.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xutozomafiweriwa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pozuwogotobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+ebook+reading+appPDF 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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 18640 bytes
SHA-256: 25c7114ebc5a846b84574fd58fe6afac1a4c6507ebbc486f465e6f33a75d9190
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10808 bytes
SHA-256: cb81b3ea4bcb59238e5f35d66a9ebca89670af214ff2a498883948b67d4806df

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