Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15a4ca8cad481ca…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 09:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fdc07c78b393348301da36dd615162f SHA-1: 80f0f2184fc4d771f847386eb9f6050b4706ef01 SHA-256: a15a4ca8cad481ca0c5519f9f824b6eced185d58e2d7426d94bddccf2c1c0763
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, including those associated with compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=wiccan+wolf+goddess PDF link annotation
    • http://alpha-cp.com/userfiles/file/lopesosena.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc45dc233---41485749965.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/lizuruguwinekujojidefiwi.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/volaruvob.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1fda5dd01504d074cf06deac7dde995/kitosi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/nalutimaxowupizep.pdfIn PDF document text
    • http://computerdoki.hu/user/file/22842338063.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/58709114396.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kq9kkj4c32gclqebgi5milorgp/wigafamomu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1l27e4g7sstgimkj6hkbfq0al7/forosoxajerojezidenu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/nobukadaluminitiri.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b7e9d0d971788e200ac9c92b8790c73a/nujomanejexowanima.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec4c57059---besuduwalebanalikajamu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077638f65a1c---nimatamewegonajukazatafa.pdfIn PDF document text
    • https://susta.vn/userfiles/file/banagufop.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xuwazuponegigawuvaveg.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ea3549511b34cf1c33af9ec84452f6f/4782864037.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/gazegazuwejexumafojinut.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jnisk6ie9vggkriqgvbqekcno0/99065463076.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/sotatapowefubevematan.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9478529399e4dbcc727ab39da6419c21/julepexepugojeraz.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/22861141803.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/pekazafaxepenabododebewim.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 17852 bytes
SHA-256: 604015e224438860122406b41d7d0f85ecd718da008c65f13af4d015d55ed64c
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 10532 bytes
SHA-256: 3fbb3563f3e566a438577f7a520cb1921a32fb68cc895c04fe98cbbd70ab83fb

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