Malicious PDF — malware analysis report

Static analysis result for SHA-256 5647b0b46271fd58…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 04:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4d6b3dd2639bd187c10a04330274a9a SHA-1: b772168ef64274422ad9c2ed72874f3c5e9b0348 SHA-256: 5647b0b46271fd58bd2608dd1b822342bbda4289697f4f337132f42a5391e011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links pointing to various websites, some of which are identified as compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=pes+2019+download+offline PDF link annotation
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jopadal.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7505595b76879dbeeca5477eb84f0654/bujujesagosijivawokevipek.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/tigupalewenurogit.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tewedaz.pdfIn PDF document text
    • http://winso.tw/userfiles/file/11518049661.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80c69c7ff---nodotipazi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fagovu.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/62686988518.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071508272954.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/30631461615.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/77338771243.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/gubiwelobelofojumewefam.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/folinuvewemisaveledujatad.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/guxenepawepital.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5bb20260---soloz.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/87886486428.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/sululinibolu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kugumisilibibidujawo.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/rajezujobopibi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84882f817---jonisivumakadavoluxoronuk.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8jb71rs3uhfac5u7ld1r409ou0/4853014816.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/88820196061.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/luvoguguwerozarit.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/goxatatetasesagakaxoto.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_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 17328 bytes
SHA-256: 2de390d0a029246f71297d00eade6ceb1758de2d4517de0131bb5e84914496d1
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10696 bytes
SHA-256: 61f37ab4fe6383a844dd70b0e33c641c1d123ad9d5e050c7e98ad633941d37df
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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