Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd28b098b32d8f…

MALICIOUS

PDF

83.4 KB Created: 2021-07-08 23:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd7ce7a91440e69c61196c166cc098f2 SHA-1: 5fa7ae73742d03bfa202eecf1bf251e2824ff6f4 SHA-256: b3bd28b098b32d8f61d593bdabe31faaabb5c35066bf8fe69c8e33af42205a73
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ck68qmnudevra51hkj7f7l6681/58022361612.pdf In PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/reditoru.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/jelibamidogarazike.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9643502929968b994b0e7fad8c4b7ce5/89167769368.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0d9b97422a2b67cf2cb9a9b4702fec01/42113716299.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5627083acf---1184677633.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97089450310.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d655590d---9572522617.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0798538be5---kejezobov.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/pelij.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/97828765817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0bbbb5d0---kasufunonoxixabeka.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d40e0d3c6b---rusevogoniwefoduzawar.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/77cf394cd95c3739a5195dd7076dab38/gibiteduzabiwukufivowato.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/10766524053.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb0b9d55c---33629647184.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e67683dfefce1dd9a23ca595f8552126/21353565114.pdfIn PDF document text
    • https://geniodelweb.com/file/reganofud.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/49598646455.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f6360378---5362382922.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/jorenufa.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/25116625722.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/22000814357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+the+least+possible+degree+of+a+polynomial+graphPDF 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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11276 bytes
SHA-256: 077b440f594eb9bb64cc9d845225d9343dd0b824b900e4836dbf4156c621de25
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 17088 bytes
SHA-256: 497948a957d25054ef39c49bca53fc3c691d149a59b3d8c4921152114bfab0a8

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