Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fd5d361ba73260…

MALICIOUS

PDF

94.2 KB Created: 2021-07-27 03:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8535439a364ca2207474da4d72f8aab1 SHA-1: e47bbaadd65b1076d0cfe99b4f4de8102aa6e5e8 SHA-256: 56fd5d361ba73260cb139dfb99aa7f6e4a4d06bf93b45699398a55136c3938e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure attempting to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7gvhi5mrtavko404ui53pvuf59/revopu.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/63324999684.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a8e183ac---balipugexakumosemeba.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nulirok.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9091e0cfb5d699700fce17ed4750b82/19164131508.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7bnpvm8o6vc0fur3vlgbt4ltj0/gazavaxejedusegeg.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be88b8494bd---7647130194.pdfIn PDF document text
    • https://famecosmica.it/file/21408554021.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9c0d1d1154e43162b051a575766706b4/sifesofegawukoxe.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/93af20e8bb155f69cc5da32a1be47f81/kataferarugivamipe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kevtnoct30i39iq7u1h83bu9d9/nezaxemigave.pdfIn PDF document text
    • https://artenika.pl/fck/file/xuzikabolavu.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/40785568548.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/buzifupavafoditazap.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9f25eae5---88595299141.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fepiwawubedujofawi.pdfIn PDF document text
    • http://envigest.cz/upload/file/fizotezadamoloda.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/86006605240.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210717_55C24CCCAE33B793.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bpiks726q6aet6mde721it3955/94393547504.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/14061472742.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca676c0243---jufumif.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mtdtddpd0ldtcavl56omc5uj6/pepezepovaditututiwofo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///84224998051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tabla+para+convertir+de+pulgadas+a+centimetrosPDF 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_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 16456 bytes
SHA-256: 1e970088518c8494930055b2dfcf658c166d436698d5d7753623956915a82f1d
font_01_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 11128 bytes
SHA-256: e3a770fc381a5abb81d47e9592d34dbcbe99eb9c5db001887e98a4b4944c1d25

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