Malicious PDF — malware analysis report

Static analysis result for SHA-256 3528dc0f01dee33d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 20:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 945ada8ad43012c1316b1be15b5d1cfa SHA-1: 665965182c12d997dd197dff627541b42789bea8 SHA-256: 3528dc0f01dee33d76ceed10c66429e1a43dd797e26621610ac8d7ea2eb0d2ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://smidgel.ru/uplcv?utm_term=airdrop+android+to+pc PDF link annotation
    • http://www.mostex.sk/files/articles/file/jinewemuro.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/68571303953.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613354646827e---98261796443.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/82109100201.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/33758275941.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/paninusafonenejona.pdfIn PDF document text
    • http://rts-3.ru/upload/files/xetifuvuwigevunigeboban.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jukudofekazilabovodijudi.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/62375125997.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nazowizoserutowopepibiwo.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210918034856.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210924035810.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/mebetajugukebilifefigum.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c08435f19---24755148657.pdfIn PDF document text
    • https://penal-garazh.ru/files/87691395672.pdfIn PDF document text
    • https://lazerom.pro/media/file/33985115535.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c2b15a38---64281893871.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/maponetup.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/melebofunetusiniwek.pdfIn PDF document text
    • https://mahae.hu/files/files/13182247578.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/27121270494.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pplmha5ercir8980vtjj85806/wuxutovowevosok.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/3570634068.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/vobofodunakenebamapuzeb.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/18392871585.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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 17228 bytes
SHA-256: 183e6a72b3dd7007f987bbdeec0ee8af517e3d9436f0e1ddbec8eed8716ad887
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10144 bytes
SHA-256: 0492c8413ec12199ccf718449913e497ff0ac1af7d324141c33cd506d263c418
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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