Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c7a48396b1a19…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 00:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 85e05f98df3535768deee8ca98ccc689 SHA-1: 92567f64395e3b60325c7adf60a22f263d98a64c SHA-256: 2c8c7a48396b1a19773e9dd75ae0177e26fdad24f007b72aeb13f5c97d3ee654
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=ccna+routing+and+switching+pdf+free PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d249f5b8---vedona.pdfIn PDF document text
    • https://anup.bo/images/files/beraxolabugofazejetubaza.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c50a31f61b3edfe18cc493b2a8a9fdf4/bafaxeroxano.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/21934632698.pdfIn PDF document text
    • https://avenue102.com/uploads/file/lizomutozo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e46c36e7efe8bd459a1b9de19edeb8d7/60313499880.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/87822259401.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/109448688661108c3de9df9.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e37a0b63---finofogojumobinonubimu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad6f03b968---39075247167.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xakovuvegorefi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/97727927716.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a77236d2---30235457617.pdfIn PDF document text
    • https://laser123.com/geektic/files/ritemitobekajo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0b0731f26fe3f59f60f73f3f7f6992d7/45116578693.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/49512822806.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c13f76a91---guparuvigaxawoleto.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/kamewopenupepuvew.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/47056878764.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/18d7cc0a4601194e45289bd5f690be8a/69613953753.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/7071302659.pdfIn PDF document text
    • 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_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 17884 bytes
SHA-256: 3c27cbca56cb36f97043a286568b1c155367a474faa435d4b25de45aef3e02e6
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 11068 bytes
SHA-256: 775a60225af123b6907bb013017992db87b13418c6a9193722228ce637ea134c

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