Malicious PDF — malware analysis report

Static analysis result for SHA-256 a922019b335d721e…

MALICIOUS

PDF

78.5 KB Created: 2021-07-15 11:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f34c94062faca658b58fd66467a07f SHA-1: cc7afee189ab6babe2e3f6efc7d164fa2ff1f6c3 SHA-256: a922019b335d721e1cbc74fe977e06ca1aee6701033814482f9ca50fa4c96ef1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+insert+a+border+on+word
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed019de389---61568025092.pdf
    • http://hookmyweddingup.net/clients/73542/File/kudisejosedowiviwarofifa.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35fa3c3d---mamifasozefeposixovego.pdf
    • http://fashioneducation.ru/userfiles/file/lufidigugif.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6lmst390h81hbo0cfav9ob71d4/94800328051.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/ragonubotinu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fc881456727aeff9445b08bba36030b4/51016465552.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920f06eef7---96844706069.pdf
    • https://fullgame.hu/uploads/files/6574412227.pdf
    • https://mfdesign.hu/files/file/tutitilodokipamebe.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/24caf88e9268419cd8ff1aad25144a6d/73152343218.pdf
    • http://donghozibistore.com/luutru/files/76840336506.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c12a6d54---fovudu.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/2808808556.pdf
    • http://j1medical.com/uploaded/file/tital.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14f6da85e---75932879932.pdf
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdf
    • http://www.findvoters.com/userfiles/file/rilubalufonab.pdf
    • http://alphanaturehk.com/userfiles/file/xiloxevarosuf.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d9632600d0e14258ffc23856cdbe40c8/tusixasaxakozuwinafara.pdf
    • https://szallas-karpatalja.com/upload/93111436248.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04f9c5e0e4---42402758169.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/de5080088ecdbaae3005f32cc978efc5/tirododugi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 16792 bytes
font_01_sfnt_off0000ea2d.bin
a61f68044e529d0bf878ccf6f1a3e5293ed4d5a5f6d2904832fc6954266def62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 16568 bytes
font_02_sfnt_off000114f1.bin
72c65479a73c2192a752a20dda225ad0f1ddfa7de4000ccdb462633f32024a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 10412 bytes