Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1ae3b3bef8a0b6…

MALICIOUS

PDF

78.8 KB Created: 2021-08-31 18:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e993f33ed07be33691e4e2a9a951bd1 SHA-1: 214e7249f1923b035a55f2c0df9caeb7567ea728 SHA-256: 6b1ae3b3bef8a0b6418ae6b1db8d5c1aff8f13eb0092ec8b84a4e6b5398e31ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b18bd8675278dee8fd657b68d7aea589/sawulunibofimozulawukol.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bbcfcc43a7697d7d4c3adf547a1c835b/nogusetuve.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jigetejotilemigotep.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sadesuwovigudavu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc538832afc---53375418610.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1077f2ee8b---gitufuwapobevawo.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/nubegeveleravumofi.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/20126548606.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/782c4c8c385e862be900abbd651773f7/detodevatoruvojerejov.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/gaduxukilobulofedojulo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/gefumikinanabarijitixal.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/6782164267.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/5329487669.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/buneg.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/gixataguken.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/70640832716.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/28370533520.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1cff4a9442b85cc713edf51c0e8c0f06/morawibijovisazurapow.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/59f182a9a1c89b2ba7c7b148361aab06/30913676530.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/47276925329.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kvdlt7rgena4u3i9b0qcnovur1/wekesubajerobutegesu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/dirigulidewotexeberu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24656553303.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/jusoneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adverb+form+of+straightPDF 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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10836 bytes
SHA-256: 8881da0861a40de3c4d27fe7271844e53597f5ec974591e05d0a2d5645d05150
font_02_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 18024 bytes
SHA-256: e5ebd043c1f9bf1903dae944c75c4a2824c39342d231944c734423d53b5f465f

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