Malicious PDF — malware analysis report

Static analysis result for SHA-256 18490f5f9dc5a144…

MALICIOUS

PDF

69.6 KB Created: 2021-09-06 02:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71b0be4d85f37f89e45a67062153789b SHA-1: 3c6553698bfd5ebe1f96c02ff511240d43b5a907 SHA-256: 18490f5f9dc5a1441d54bf99bda9c3daae4cf9b493ae6195a552eec02af8bbdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=income+tax+act+1961+pdf+with+latest+amendments+2019 PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87c78682c---40506209264.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/silotekipunaberijoxate.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/mopubaxizodux.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pakilotumogonizizepimin.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/71788434842.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/36247055951.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/657832484152b119e8c142aa0295b803/norovufozeruwiposome.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/52389664080.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/pafezemenafovuwufelexora.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/pajirub.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/22684342643.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29736655491.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/22534008118.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d236cca04d---levonesupidenokexifo.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/folabejenikowigebidigaz.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sbm4vulptugts210v7mnrc6911/kegebidetusib.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kujipaxumono.pdfIn PDF document text
    • http://uco-kampen.com/media/files/63202332934.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/15056394946.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/57fd332c105a347ae38e9a1978ac9102/difipexexorazewanipufa.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d69377a88813a677f0fb60db4bcea0f6/tejusogapumuxogesi.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-14/20210614205814189907.pdfIn PDF document text
    • https://mojer.bg/files/mitotez.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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 11556 bytes
SHA-256: 0c843add778b77e01db72acf2bc563fb8913a48bdc93f8e3e9adc5f5b1d5cc2e
font_02_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 14736 bytes
SHA-256: 2699c39dfb2a73573ee4a8c1c5325c37a573a3b80d1a03a0b083408bffa98f6d

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