Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33426acb0e380b4…

MALICIOUS

PDF

106.0 KB Created: 2021-08-19 01:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2dbae5c266f64f47ec129a8b0503d683 SHA-1: da16eacf48d9bde446329d9c6e4398060be50d29 SHA-256: d33426acb0e380b4fc24e11b749d39645a6bdd6e095d4d1367f5357a8caa84cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the extensive link farm indicates a strong intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=cuales+fueron+las+consecuencias+politicas+de+las+reformas+borbonicas+en+la+nueva+espa%C3%B1a PDF link annotation
    • https://orangcar.com/app/webroot/upload/files/xejenonulapo.pdfIn PDF document text
    • http://berbun.com/user_img/file/bakuwawufekugefo.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/24636909919.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf76a0379---vefelifenawifosudewefa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-9/20210809180613243308.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/98065930082.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f2be41bab---vudipokelapatitilorov.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/jadugunekewi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/65ff1daaaf422e0fb4b575f204fd8498/11870324954.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/25395640681.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/41759750668.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/rekub.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac469a050c6---vufabebifevaxopenagop.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608574c1e8490---gerone.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nutf5enrna2o54b9nluhd9c6tj/rotogegapofem.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/34549858151.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fixutezirafizikupetu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0egmoihi7p3si6feolj8ld0n4f/gutojuruvuneditapaxoredi.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/lenolujomelanulokutukafij.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/mesemamixixarenirig.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/nipudofurivowefutogevin.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ovm0rd18tt2livrfm76e5nd8pc/gogagezotorerub.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161166562d4c75---93844194287.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_off0001353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 18200 bytes
SHA-256: bbecac12b62b556102fc06adcf9da03f282ea528eb7374b47567b98c0bc8b38e
font_01_sfnt_off0001631c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631C 11324 bytes
SHA-256: 5504a990941027f37cf613b3520b37c00a29e61a56c0ed98fb5182b733b3c787
font_02_sfnt_off00017d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1