Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ffbd89272b2dcf…

MALICIOUS

PDF

72.3 KB Created: 2021-08-29 13:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c58d1dd3ebab603d411360a9328b8fbc SHA-1: e6ce19245ce2e80b4a5558ec95c4794ec8571ee1 SHA-256: 78ffbd89272b2dcfb1c269fa77aa01225f958f9daf4f55432ab0bedb0a138b0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9400a7f0c---jitul.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zibewowabixidimena.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/zarironidibujakopetojexon.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/bisosexukur.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/96923105147.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/29jvkplgfs7u20t57fad64lt1b/68141667228.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/jesizowori.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/55392119436.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e51541fb9640bf880aaa16ab8cfd776d/woputojoxatozosapud.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/mitixoguzaz.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/pesitaruxewejaroruxo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160911fc9a6808---ririsupaze.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/64af564617d2cb721fd20ed0a125a968/joxubozedidekono.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/8267493307.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/75255295507.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c690dc97e7f---pamezevonidovegeniperoku.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/37423187894.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/768cb20c936d702ac4113811fe970c9f/77129758749.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc8cb69a1---97799895595.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc4fe9cbb8---49748390878.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/51349141133.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpnj0pji0c2k8qkb3ahp9ba7rg/dazemolizurufetog.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/65207840639.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34994c5a2---20192192737.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300fc67740---93965838792.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/69563442561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+free+agario+coinsPDF 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_off0000bf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 14224 bytes
SHA-256: 4fd9e2415900588ed264ba4c4e42ac91edf552868b41d30a06f9a0f3ec124730
font_01_sfnt_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 10540 bytes
SHA-256: 97541d7d018db230c95785763b063b230a247bf41e551eaeb701795b5865ec6f

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