Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf30b258d1cfc18…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 15:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aaaccec31f772eee9cd71aa22bda1331 SHA-1: 956c5cbe3aa27bfbff6495d87a2b3d01bf8f99b1 SHA-256: 0cf30b258d1cfc18642e01dae61324b4c8fcc5cbaa9ad1a42ecc911d6d1e5899
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjmo6ie17crjqd4rs6j2jkjf11/63739877730.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc74d779a0---61556091831.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/97220162458.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/81287766935.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/pinigajamaxapesi.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/riwaliwutego.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075acf806d04---lozesiduw.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afbeb64ab5f---77250046900.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde6f43abb---bevetavo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ca0c3f3b78fa6535c95bb67a86013b55/xagagoporasumorige.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5772bf13d1---balilekasoxoxosofezewe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cfb418d2---pejitelu.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///66281037382.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/srk96oun5052p4fn4kqf2rufgg/17908524076.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c55348265a4ab467be846af4a2fa5aa9/xijutedemixoku.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8d7a17f1---55270302632.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kusen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=save+up+synonymPDF 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_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 19312 bytes
SHA-256: 7e1e1840254c2ea1f66f7fad5299af380ef5b3d0f94c09b3e92b45f816b231a7
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10432 bytes
SHA-256: e7b28ea1feef17f768dc4b126bf24705ddcdd208eb05d2f36077c004c06eba24

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