Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e935b0d815c707…

MALICIOUS

PDF

91.6 KB Created: 2021-07-10 07:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fdf7f853b54e86d322829f4eca792a7e SHA-1: 4fd033112f38e72abd087acbbce6ab7a511635d7 SHA-256: e1e935b0d815c70753d513c496adc016c197b8f772260a1d3df08e21ae22085b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=best+rooster+breed+for+fighting PDF link annotation
    • https://drsubhashawale.com/ckfinder/userfiles/files/68500176271.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ddc20f82305561a66d34e693561188da/jusatidasigufuzigadageli.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/90e454cbd88a00bbd5e8e1a6dc25f1e2/7461884254.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/76304607192.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/12237876796.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/eacd1d881310cd6ef40b7f31b2f1e837/kojaliwiniboga.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5483d991f9462815d180d8391ef1c831/warupetoridajofo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • https://esvigo.com/upload/files/98941949597.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9jlak3lojg18q2bnksc5odjf5e/bofosegidepalebizer.pdfIn PDF document text
    • https://luminex.pl/upload/file/28316688670.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oe50ehhla5hickar3vt1n00dh6/zupogevovofogonexewafumit.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/sawedurukipub.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/17748060486.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wozaxupivavosotugijase.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/85632710096.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/73782633335.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ba6bf73fec0184a8228219f325bb0466/48019568141.pdfIn PDF document text
    • http://c-six.it/userfiles/files/51476982440.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/pizebewe.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfk0ud6u6fsv3v77ulhjkvq6b/gafabedu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99422a1ee---zujuzubiwajab.pdfIn PDF document text
    • https://isosklo.cz/uploads/suvukowetepabija.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_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16632 bytes
SHA-256: f5d1b5d1a4299c86b4c3a3376f2cdd3ed405d88e5f388c2421b924083a7b13bb
font_01_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 10616 bytes
SHA-256: a1061b0b824ea699d8602b30dceaac2c1d5deb3dc6be7873fc2d5948d50264cd
font_02_sfnt_off000148f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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