Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca2cc3264980533…

MALICIOUS

PDF

93.7 KB Created: 2021-09-20 16:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac3eca589c1c4b555378b426f1f5661 SHA-1: 5a1edce525d58de1960fbfc03e0cadefb0af923c SHA-256: aca2cc3264980533c659e173431333bb60a2c2c6fdca68ff61ec15a707160bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely attempts to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://drafthe.ru/uplcv?utm_term=loops+live+apk PDF link annotation
    • http://www.celso.org/download/pawurijofap.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161328f6aa4047---55190430370.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/fedatavafi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a7dd3bf7835f8ae21289088bf6946a9/93600631401.pdfIn PDF document text
    • http://kustari.net/userfiles/file/jinip.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6e34a591b9185d3a6a27d614eea40ca8/11848431570.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/felipawudejibuzowaz.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/50741812382.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/fomavovijavutudofalabu.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/25047072275.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/najiximuxewelami.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109170032593391.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zidegujobivew.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jidutavofoganaku.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/11229683455.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf8d084f1---luvakipenukidizetanebo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2fe66260985f06e70347e5a10384f058/gumugolu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a86epv1qdr44pe2griqveenkkf/57933582492.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/11335601834.pdfIn PDF document text
    • https://rafautama.com/uploads/file/fezifat.pdfIn PDF document text
    • http://mfcpavpos.ru/file/44400278017.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/24610305012.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f931d0039f---zuwexudevinib.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/totu0pp2tforaa02ki05uehfo7/lusedatozudabenavo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 10060 bytes
SHA-256: 0ab90b3cdadb3218b3e1fbbca4b356e69fbafadffab406ae0a9b2ce78b579d82
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_03_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 18692 bytes
SHA-256: b231fc41e6fcd9ea6dda8b32a9482ccead75251028c093e355fb0e52f1c15521

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