Malicious PDF — malware analysis report

Static analysis result for SHA-256 1145c362e1a4d5c8…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 00:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43a59a14dfdcc15a79c02adfb5e4c3e4 SHA-1: 1aaca2e35ffb1d4c2b0c82d616cfd5b7e65f4a8c SHA-256: 1145c362e1a4d5c86bfa05ceafb9548cf2fc0aff56f7d7894b20768cb3a9e463
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://barcelona-health.com/files/galeria/files/fuxudedasadesufa.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/81524649513.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gedoxu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/i8l41jk0s6dksti0gct2odeluk/96492873875.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badda2b48e2---sedexuvatifere.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd3d4d6c0---wivasiwanikaxujujuzifi.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uutn5lopq85ak2ed568ngeu8a0/68572947794.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e41f3bafbba5f476467b7609f674b5f/tupogozolowojez.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093af0124203---nepilekojupe.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b839aec6397039f43ac85af6e1c2ce12/nuniganutovo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/bugisutodudisoribev.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e1e5d23e---55667127945.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5ci891b69khr3c13kin2conkcd/saxorodatumaxevirevaduk.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/35274379427.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/36157818284.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7910db6---weronuvuwimunoponoxezu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86f80d8813---dadetidilekesijagipi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/mifobedafekusumuxofu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607414aef40d5---xikijimalud.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/supivimagi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zamabuwo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a288d04955---jufawununojabevoro.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/xejemofisobekowujazaxoruj.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u8tojitgiq4ubl61t9vg4mm3vj/nujeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=last+day+on+earth+dog+cratePDF 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://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_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 17984 bytes
SHA-256: 9cb0f3b2edb717e279a95c5b81cef709277d1c24cc29fc1b485b7153f3f1f461
font_01_sfnt_off000140ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15916 10580 bytes
SHA-256: b3c697d29d4acc33a7f4deefa8bf5d03ddcac5ca814dcfca8bf2da176593bae8

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