Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f6a137b661e6c2…

MALICIOUS

PDF

75.8 KB Created: 2021-07-05 08:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5d45c027b418ef266a096b4703a1d6a SHA-1: e97f16acc5c883502b64a312d638ff25ded95339 SHA-256: c9f6a137b661e6c250ce0019b8f6577dc64da68ab619c07d21d551fcb598f391
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics indicate a pattern of SEO-based link farming on disposable hosting, likely intended to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=organic+rankine+cycle+geothermal+power+plant PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/316f69496acedea294fea560fa2da316/77075743037.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/9bqp12372l18p7aunm6mnnqcba/74524281334.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s8v99t9dlot3m1a0mt3tcav6km/74808876353.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3d1575f1f7bb162c9dae1d90352b0f6/52595129084.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/70741424804.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f313f5dcdb502f65fe495fd447dfc097/wiwasidomisajuzexejenax.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609529b9d379c---27047258301.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e505e6722b24f934904272c3ba9cb658/pibejodomidutabav.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37c3fbcb05938536f52010dfb7c480cc/67197105900.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/jadezadesevijedal.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/eqv85bo12g4l6infikc5t94103/tigepipixaba.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f7c35c75---93837491417.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xajatofanokeka.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab700a3da---99787786718.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///63786371996.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9e56e570481e29c79eff9339e41b517e/32572879739.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ced1c97a38e---gegusa.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ba99ec59b3dea8e2a0c21cb729f5e595/53870569215.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/moruxujategobipanux.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fd49904d6858bc29fdaeff1c70e0ae13/vezewobegumotu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1f0ed88fefe86ae3a3075d11ef9fc5ed/leremijulevugiporagida.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3008471784.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2v0atp1sd69i48jbe79fcajm73/84111748585.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751e906cbe---vozugekukogubozur.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16676 bytes
SHA-256: d1a54f56acb410e9d9eae6e24ace27ddacaa35f55d19cdd5a898aee62b9d8bb1
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 10968 bytes
SHA-256: 45f045a9d6e6a2332b332f8d962a50528d0f52260641bdf78bb8cb93890ee174

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