Malicious PDF — malware analysis report

Static analysis result for SHA-256 882a62566a96517b…

MALICIOUS

PDF

89.2 KB Created: 2021-07-21 19:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9dc15cd7ebbe3835e5dd0d0d07626f5d SHA-1: fcf5b27ddb2dd25a96dcd3f4c32cde93b569fa3c SHA-256: 882a62566a96517b35e18570a74cbedec57366adf9bea72e64ee597e30e04a47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to drive traffic to potentially harmful destinations.

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 http://yaqeen-eg.com/userfiles/file/16626151107.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b938133bba04e2c77fc2678d38a86c39/bubifirukeb.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e54953a5a633aff4e36c4481ec13fe11/kukefiwu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sobebevemiwefubivuvotum.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2f8391b3b26af243155c646aaace6376/nuraso.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/vugisifix.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/tatixaku.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1021881e33adb197f37c2096a289c3e8/fiposobibidaxa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7eefd77aefb5186f356da5c817177b2c/nukavogexaravilejakeduxav.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/dbc6f8bfebd1468c70f054afbd4a3a13/49772702870.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/10508109802.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c88559fec---zesoxiwosasovazorap.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119256b794---gudapagusowewawij.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc129790af---xebasapuw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/13941341373.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/93580256702.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/nilokozosawimemafazu.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/68048228299.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u9vbidjjcanefq6o2f56q2k7pm/4873776301.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/fa8a24fb4c255ebbb8faa86dab9ce2b8/pozolebalivesowilakofotab.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f968b0966---lusutijapeladisozofasoxu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a769563cb7---26849586551.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbovd6f441uh7mngvsnuvpn5en/80131555581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arihant+physical+chemistry+by+rk+gupta+pdf+downloadPDF 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_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 18496 bytes
SHA-256: 34a4d947b92e3514e13fc68db1d7e609be5084df5de575609e2e0d792a2cd3c9
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 11580 bytes
SHA-256: 6b53d601753fd1b280a3a30992ba6a03ee745ddc54d266aa57ad2db8f763b81d
font_02_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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