Malicious PDF — malware analysis report

Static analysis result for SHA-256 6437362f3a02488b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 06:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e07372dfc5cd73d3574cc115fcfa65d9 SHA-1: 371d8764e494e5eff4f2aab705c168f1b4917c14 SHA-256: 6437362f3a02488bbcf042b57ce300e1e3349243e7ca3c82b30f71f5d9f306a5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple PDF files hosted on compromised WordPress sites. These links are likely intended to lure victims into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fvafams65244i5u5qdvjqpbg0k/gujonavasawugubi.pdf In PDF document text
    • http://inezorviskids.com/clients/37546/File/78571272169.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/82705528260b51ccb20648.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f1291b15699acf5f6e22ede0f8ec5caa/bulujasu.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/luvokusimamobiwar.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/24514269272.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1f47e16f---bepunubofaweba.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f959737384---sobevis.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd7d09f1e---99139001753.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a3019b35---95780066887.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b8694c5b---65296914606.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pibusavenazazivapuxoxoped.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5fhtvappt7i8i45sev98jsdj2a/2905967670.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/r8j3fdhs0thmabclg4d1bq52qd/lobap.pdfIn PDF document text
    • http://capital96.com/userfiles/file/98281011924.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/24328921963.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/62845341613.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/nisizugijimilogukaw.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/16628774177.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/ziwukek.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160700838283b0---jivipabavi.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/b40be57d811b60cbbe31ba033c6361bb/gifuwo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/kiminavekome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minimum+wage+northern+ireland+for+16+year+oldsPDF 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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 17388 bytes
SHA-256: b86afe6dd8deef459fdcfcb9cfceb7f257d4e6529e21c6f473ac0064563b74b5
font_01_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 11316 bytes
SHA-256: 699ed75a0476e05299412c0902ee9e055435ea2f0f39049aa2aa47a4665b52c9
font_02_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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