Malicious PDF — malware analysis report

Static analysis result for SHA-256 238b3935e77cbc88…

MALICIOUS

PDF

98.2 KB Created: 2021-07-07 14:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a6cf3d1ebe0cf2c214d30c3e183fbb7 SHA-1: 66e13d3021c349195c480d3799be6900798d443b SHA-256: 238b3935e77cbc88c93e682ebf2bd135e44afbfd674af3d2e8c1c5b8cfbdb4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and point to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d95b8cabc158af8dfc87269ddc7e535e/japekekan.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f348eaf636---5268360857.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/80100032780.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a06b4238b---lasarevol.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81d18daf9---momowagirofuwun.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d944028a8---35069454421.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/72325442067.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e91428b8af---rixugixedivu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89736932666.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/94137317151.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/50300678308.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kogaramavaxute.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c7a0f2a9c6a31bd9895b6f04c5273815/zitulumagofuwolevamakos.pdfIn PDF document text
    • http://ashioke.com/images/library/File/40405802030.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lawivedakagilonodurudo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/otigetv8c6jv7q9vsbngpk6cme/putexawatorelunifox.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-14/20210614180951231008.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210622185657.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829c10c5afe---zekozevuketu.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/70694530357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+connect+nexillumi+lights+to+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_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 11000 bytes
SHA-256: 1f28d11c48a8d4307ce9a3564b6bb908d32b873b9379c3c1e87be45b03a54aa8
font_01_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 17596 bytes
SHA-256: fe4b9062b87554a4f83e59d25f70d722eb9669167470dee4e48c76e496677ebf
font_02_sfnt_off0001639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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