Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bbcdfaaf58bb32…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 06:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c7785d1978f858388c5b076dc3baa30 SHA-1: 816fcbe4fe2c6f82f920c495ca16b8746644e402 SHA-256: 28bbcdfaaf58bb321881ea0bf5e6f7f0d1acb3f193bfa03a525ced1500f69809
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=things+to+do+when+bored+for+gamers PDF link annotation
    • http://montgomery71.com/clients/34132/File/459611889.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/12279387950.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3ef86e7762e9f2135a40a001c8c9ed29/78724384936.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/58564764371.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b6c7e23c---bufuronegoxojerosox.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fugokojogutezemaguvek.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5b5357b457518760a34ca8f92a0a210b/kipaweleruj.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0227312d02daa04f6a18515b2615656f/827875334.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b24a45e8f0e0a35352131c8709430fbc/79070489723.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/wopekujetasajo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde404dec4c---26144431602.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2fehddukecs2mi6hqhivq1seef/relusun.pdfIn PDF document text
    • http://voijin.com/userfiles/files/megasepu.pdfIn PDF document text
    • https://foulardfotografando.it/file/23728010821.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/dezaba.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/67163392453.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192a57dc52---neboxezuxika.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/badigugozadamule.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f83d6f3a---nasezikelerijofubixidim.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/4310168889.pdfIn PDF document text
    • https://sy-tech.eu/file/95734539951.pdfIn PDF document text
    • https://shopabrang.com/images/files/43698269551.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160949248b98f3---7236134818.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b46d4a153---vedisiwibedavurajewuvob.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/415c2de4d8747658f3158b1080c695e7/megixofelifezidoke.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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 17924 bytes
SHA-256: 02dcbcc742ae159bc357dfc6618b1026677c4557902aed57f91224b7b0ed577b
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 10944 bytes
SHA-256: 7a067d9b8bd5683b22cd95a998adfda929440991d3c92a25302c3618956ec0b6

Open this report in the interactive analyzer, or submit your own file for analysis.