Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e995c8dd1836da…

MALICIOUS

PDF

74.0 KB Created: 2021-06-27 22:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b739e13101cefdbead1fb9cad7a395b8 SHA-1: 3e869624178ea41ae66210c14c43c18275321fac SHA-256: c1e995c8dd1836dab93df7b102a7513c013169d3eb39da7108659712e1adcee7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baigiangtoanhoc.com/upload/files/10557014196.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/148bc9a4dbe41af28f0c6aeca12efd24/51793059935.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3c1147ef4b5489753b24eb3955c372aa/pivomabunevazoximotop.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zejotufevipegodepakanupiv.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/46905022332.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/4859350794.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b016d97ea5---75152533840.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073533e0c95d---padawewumolepurod.pdfIn PDF document text
    • https://vestol.bg/files/file/wisepewosopile.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e018857551994bf25413e96c6c37143e/vosezibivokabutemoweronol.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0b4c9867---golanidokepevimonuxejetag.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/10903074742.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/15ee1600ef9f3b4db9f8ed0b6f0d6162/gebobelovagasubipujuwuzov.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608951044b473---43068258140.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/gumar.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a27fa60221950958861923069a68643e/megotonemuwawujon.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1f12d20---bexelulujupupok.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbeee5ee8c---zoxelojezaza.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gq983gclngh6ouai3evc4qhg32/52288650100.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6rjo2gbsp6u8krl5e5hllj198h/13515919658.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/ridegaxenudidugiwa.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/pumitasuzafasedape.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b186dc6996---66196390407.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f7e95d9c43dd8ab03c9f86c9a8d92c2d/64223491496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=primary+6+manualPDF link annotation
    • 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_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 10136 bytes
SHA-256: f8f2d8db535ba1b3c009997d5ec10731f24c38994b61c3db636e1fd0238fdc83
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 15976 bytes
SHA-256: af93b6b565ca6a906433f74322af79dd2421faf0aab164858afea8909ea90df8
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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