Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a77171913c7143…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 02:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 013f3c24fe9dde078eb519edce8a63a7 SHA-1: 7eb3e744c187bff26a3086325b58859a2c2424aa SHA-256: 15a77171913c71432b2001986f257e059ac136be4f0e9e24e45387c103012fd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan payload. The file leverages a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and associated URLs strongly suggest it's part of a phishing campaign, likely using embedded exploits or JavaScript to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=price+rite+job+application+pdf PDF link annotation
    • http://dzbnf.com/upload/file///dijekipitokina.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/femivuvugupamelusadila.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fa43522mfgqdqj9dudf05qmfse/64162988743.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98029ac67---siwabixuxavofu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a27f720d3---54561960431.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75523c274954c0809b0272f758ab8027/fuziguzovedukisoneg.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kexusigojijedanupebimijek.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607717876e972---38506960096.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/hnj21phgvgo9rqhb5stlfuluku/senituvuf.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/37vo2cq02n1mr08cvoal5f1qir/54378215042.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/fudekizuvirip.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/59097445391.pdfIn PDF document text
    • http://waypl.pl/upload/File/zewabubezepakakoluf.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40daca1854---jusizaw.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/42176739971.pdfIn PDF document text
    • https://codecs.ro/images/file/ruwowadin.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/karubewunobolomazexezaniw.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/89268fd00549ecdb1524af35a14a0cd8/xilelomegomomap.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123ceb3447---gupuverejudawuburar.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/liwojowiri.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/zidumipowefiviwunadobekan.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3328a550---xuvepesor.pdfIn PDF document text
    • https://mytopics.it/uploads/file/peburulisirox.pdfIn PDF document text
    • https://raljob.com/userfiles/file/nutiparovubewukopurufisi.pdfIn PDF document text
    • https://yasacompany.com/upload/files/beliriluvosozuxa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4735b7f3eb9cd2cd4d162aca7f1c0c20/89601223295.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16528 bytes
SHA-256: 1e1cb7314ddf1f1f2e0e67b513c8a9371610de2a3d529a48b4e7d2eed2c617ee
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 10716 bytes
SHA-256: c69885d051accda57b78ffa95185fa1fed45bc4a52dbd16afc66bf5f71e7a0c4

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