Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6f47851ea3ca1b…

MALICIOUS

PDF

111.9 KB Created: 2021-09-08 16:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 708951da4fe161ec5424301f7cc17805 SHA-1: dac69571aedb061e54168ed94a796d1b3a4b753c SHA-256: 2b6f47851ea3ca1bfdc32917bc63b2e7af2d7cc04dbd76336ef68014ce250bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=codigo+penal+distrito+federal+2018+pdf PDF link annotation
    • http://www.rify.us/cms-uploads/files/79010426896.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/sadazetoboju.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89509288452.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/wemedenixat.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58469514330.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/39309502669.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/gorufagug.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4210b2c8e7043fa9e1c063b050c8104e/kivojabutepuxe.pdfIn PDF document text
    • http://aven.su/userfiles/file/xajerusemox.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/41010326348.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/vixupep.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/75564677112.pdfIn PDF document text
    • http://sentai.cc/data/file/20210904_041530_251.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2328e5fc---gagukamew.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumiwazotunemuv.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/77275329701.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6886db26---bugomumagafafinuvi.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/72386027313.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/tabukegijosurefufalubiwi.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/zatigawixodinus.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/76685706347.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uvusuzekakoxagomiwatoku.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/guwoxewidatatuka.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_off00015054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15054 18224 bytes
SHA-256: 63e1f53f405aa27aca3d27fbcac5ae869fae3bb5f7ff179ee28a186bb880ff0b
font_01_sfnt_off00017f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001976f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1976F 11208 bytes
SHA-256: 275e3a4690efe27cc8ec38d43253268433596a108f263ca2bb8a03c4dbb6d606

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