Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e194a4feb2c0b8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 23:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab6ee4e39300db4714cb6828fa48d2a5 SHA-1: 6fd87bf48a0701c3fcbfe236116c57ac167671bd SHA-256: b6e194a4feb2c0b87dddd20a344a3e92b3f09f0fe28035a1c83d1fe3a9bbd8e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links, many hosted on potentially compromised infrastructure, strongly suggests a phishing or redirection attack.

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9f5616e197eaa3b0cef1a02a50345cd6/32551977063.pdf In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/37258489485.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f030db5e900b7e814d1a5673832d91b8/36690216423.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/levebox.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/27954525444.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1de66657---gosidefepija.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4726094934bc9ad4f8e5919f96eeff81/resufunodixabidaxoliludu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d18e2ced5---vajapafibiwazogupep.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/5967746908.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/damulesakosolurofebipewe.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b5ab5ecae079d4a551f3959cd407d140/jukikalejasafazemijivi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-08-12-12-40-45.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/vodavatogad.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b21cf24fa---22905512768.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jodizovexes.pdfIn PDF document text
    • https://soechi.id/userfiles/file/luzepomivapodaxubakaje.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16116c3a5a484d---kofilupuxame.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9006010174.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/81108326527.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/saveber.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83578723e---meleguguzenipalefumele.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a974f2d45---11749050755.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc126ac87---zavefaduzad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=exponential+probability+density+functionPDF 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_off0000c1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BE 16516 bytes
SHA-256: f72bf5d38237f0f9a76a2dfbd5f4a60c95dd755afd7129b06ced5de60db1b071
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 11052 bytes
SHA-256: 42c7d4fd513e667cc470a7b52e100a7791ddb99cb86681e6a3e86d0a28cb6f2e
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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