Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df5d062a8894612…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 19:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a00acd97cb7387e64a5a0faa11c7cd21 SHA-1: 57305867f693b04091a5cca1a16bd25a52c0019c SHA-256: 2df5d062a8894612a5aacc3c7f83569d6cab2a9b10a7d37f217e6fd5166f51cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=reese+brakeman+compact+manual PDF link annotation
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8ae624d88ef067e8accf4b68f19947b2/nadawerogerozipibojugeju.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/sugigupunigogisazefov.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57b0a13bf---fasavapadilorewagodobun.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/1976361598.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/47992409668.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/wolikerazupugositesegu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/66458575302.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tupukofubuvalupoguje.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/voxuzewefuzixete.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/kiwusu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/27795951376.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a758a6cc---66879992875.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/vabetuz.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/lixefideraxebate.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c861ef9a---44576150329.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/62349469174.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/marukapujalumokuro.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b611ed39e4b354d854cd477addb256a/56834434188.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/17726761615.pdfIn PDF document text
    • https://esvigo.com/upload/files/11225184261.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6d2dff1d9de70c4938f6c13a385b73cb/41528445411.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 18324 bytes
SHA-256: bca342f467da3570bd4d8c0d839922a1dd22a8ffe3f955ce40482c23b2ba32f0
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 10820 bytes
SHA-256: 1daf4ab45f4f2448d5ad7cb06d45b68e780e4b9be52f3e9ff2a09ae62ded69d2
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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