Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fe19920432b304…

MALICIOUS

PDF

87.9 KB Created: 2021-09-10 04:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a97e5726dba3905b9cd9cc6a796625a SHA-1: 1e8fa7bc72efa896102f117186ba11a21f22bbb5 SHA-256: 94fe19920432b3041c4cd0766a71b9b1834410470fe4eaad30d7a717e46e4ec5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites for further exploitation. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bf69fe70f2adcee78114a90416a3e5f7/68015953637.pdf In PDF document text
    • http://pbhdom.eu/userfiles/file/9596357889.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xukigogamevavetonuzoxo.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/55238591736.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/xeradaj.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/40568261997.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/18045020439.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/wutazavo.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/43621552627.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bagaf.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/88510436659.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/jilazuw.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/25309449991.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/092891af1e19e963da4c279f0be3e2f9/fevulosejebunonegina.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/21211972366139dcf779828.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/liregerekujefalabexa.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/35020407145.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/radubafebakije.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9639d3fcd---benafosiponexaxajaf.pdfIn PDF document text
    • http://twilaw.com/files/files/94002811032.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/silaperojamatados.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/74486863355.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/46637960869.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/raxuwesikil.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nenakalipupubanezumekeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+clone+wars+campaign+guide+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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11120 bytes
SHA-256: 50f474e7c08ace9b7a7f9829eb94d8a6156a33c5896117af34614c6a88b946ca
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 18780 bytes
SHA-256: a5989d67718eeaaa1e5173649eb34c4808fd12a2eab621e23ae82ff8dc5c352e
font_02_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1