Malicious PDF — malware analysis report

Static analysis result for SHA-256 126d7ef8d34ff008…

MALICIOUS

PDF

83.8 KB Created: 2021-07-10 11:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1be9a6e5e0f6d56ee61011e6cfb32d64 SHA-1: 086082cb0fb2803f44dabf4fd10d3b018ee9324b SHA-256: 126d7ef8d34ff008e32fa4cc6d80ef8bab3b58b179b9839716d659f3ca546d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=oyster+shop+near+me PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bf2ce240048154cc22eee9406fb25702/nowoditajum.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/37128100133.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/60726944662.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xijaso.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/funewosodifok.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/32791858726.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/renadezeren.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tegiwivotiwilisidikaburum.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/jefelulemifatifewugojik.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1igj2ojttf581s5j0evtj0iv77/59006409688.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83de6b512---43678886469.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tujeraribomob.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ed24fd2470e05430e2ed13dcad9fa630/fitewuvoxirirejetegawo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/55301ade9a71e1f8c518708a350a8e44/64102716030.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/94385746860.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8f7ace0cd48136bdd552e46257137108/pawegidejusevi.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/afe564b1fa61c903660aa4db3b3235f3/mutekuzoxurevesolusutem.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/kediralav.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/45aac39e6e9d12b4c1a031d635eb9bd7/84731079406.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/20ebcb538a6d3c58fb9ca9dff9eb29c7/bizivixibesut.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba709a80632---85562605614.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a477714ec0a---nexamuzafuvipizimosij.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076142a7c80b---50432198685.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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 18768 bytes
SHA-256: 040ea09a3b4467fbb55ceb5173da7e66b81f1864be7931b3dfde960936b5bc70
font_01_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 10520 bytes
SHA-256: 88acd595687003b1d1ee630f71a527df96d3d54ae003adc1cc2874d564dc9aa3
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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