Malicious PDF — malware analysis report

Static analysis result for SHA-256 222623768fcc8ced…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 14:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d87a09d5b9175a758bcefbef0b52618a SHA-1: 9d3cb58d676a60571d2c7950c071e9ad7f1f95d0 SHA-256: 222623768fcc8ced21852d6db301dfde5b9b228615756f5a0415f057dcd4bb97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of numerous URLs on compromised sites strongly suggests a malicious intent to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b754059fa25---41541943540.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/38c088348a0a3944cec8b4fb57c54acd/63906390318.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/61597994682.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2ab5e6428---63658168041.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/bakilerogawilakepodoze.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/xuxavogotudig.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096e10834d15---pofenagagetevameworev.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/larop.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/11628650535.pdfIn PDF document text
    • http://jar-ted.pl/file/sujogo.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/30825921265.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/nanifugoju.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8d02e444d---guzebitajoginevugor.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/55266162950.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c075e6a9fb6---64644552139.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/zepazuxaxanemubigojeruram.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/somebevitoruniwiwuraro.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20b9484e8ecd263ae15390e8a1151f11/10221827687.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/51952520306.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fff7c3023c76c750ff2235f42b23dc24/xazigitakenore.pdfIn PDF document text
    • https://firmacorretajeschile.cl/upload/file/9066383276.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad01ea17c3---julutubemujedawupesimaxe.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d096aee3f---16659239882.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jinopovesetomifuwize.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790504847d---69453829468.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9acb6f3bf---34417891153.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca56d1b0ed---rowelufuvujakowamer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+eat+raw+steakPDF 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_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10388 bytes
SHA-256: 77e1aa575650993f3eca1d82d65b60d6643dacb21cbc61ffda1afbe20db82847
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 17656 bytes
SHA-256: b81e147e1fe5087fffbcd6ef6ee4e8186ba54ff69366337d366ed7d48d8d504d

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