Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345df3f724a25b4…

MALICIOUS

PDF

147.8 KB Created: 2021-06-26 20:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5157128951e858f3dcf982325287019e SHA-1: 790c50ff41a45d0671997b812639e75b390b5a29 SHA-256: a345df3f724a25b4bb2f6b30950dd105ed5e3c49de4c971e8d516095e73eaabd
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=fnaf+characters+golden+freddy PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0837c694---zegepo.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/34852019493.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/wasegemakiveka.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/42654930647.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/58640859609.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a08e9993---robetak.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d0bd3ce---busizumobuzebejigupomeg.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ae9640f6---68354551894.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1878fc6b1b---32756476739.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/36eb44b3489b792e4b800d275e430f55/63640642173.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/44680d40529b333839bf27688b7a8bad/puwokopise.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6f9a79bdc41d46e22246588d8f9b70fa/75511934608.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wefamizejifarosit.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732e1cb183c---foruzigarokavebive.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/zekotuforaxajobab.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/lumaropilurufebaz.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/84769129446.pdfIn PDF document text
    • https://cubic.is/userfiles/file/lobafixixo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051412183522.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/h16cb457vbcplcvqfphnlvilvj/76237210990.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/00f817cd0a1a74fd2089717c25bce6e8/xanaputinukasolimog.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74dba5b45---zuraboroxujinunuxezalas.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc7c916e5---baxuwakafosodiz.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/24783885263.pdfIn PDF document text
    • 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_off0001e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3DA 17392 bytes
SHA-256: 47ae4eceaff49b855ef8b2d2cad248a2d26d848d4bf644cfaa6d547b9674c1f4
font_01_sfnt_off0002113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2113E 10752 bytes
SHA-256: 8a5e60b4aed4ef72f84499c27dc39a2e7120458395f4eca9178b30a0c9ae5dfd
font_02_sfnt_off000229c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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