Malicious PDF — malware analysis report

Static analysis result for SHA-256 801585baa0482e8a…

MALICIOUS

PDF

91.9 KB Created: 2021-07-12 22:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dbec2c6c94b0268669b10bf5b55c4655 SHA-1: 8dc30cc11ebfa275da8ff4e57f6100d2881b2a1c SHA-256: 801585baa0482e8a44dc13c685f8ddf9e6ac55611e6fdcf27ddd4510292ca2a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or distribute further malware. The embedded URLs suggest a tactic of using compromised legitimate sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c1ced1fab14fc96b6feb2085eb21472f/zodofibazujesoxe.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a832e1ce2---vagutotetedinifemapowi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/95664347151.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7be88c82---xiluguvekudogas.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab55f2ba8c---rimademuvowufikofaz.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vimibofediloweg.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609804747b489---lezelixemariwefoduliwobun.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/22339862948.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dadijuluvuxujase.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/775e9e896ec47a03924b57645fe3d884/96608775237.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rufatudar.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e1fd7ad96fae50a5b831aeb665a8771e/lotiduvefunepeporemujur.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/tudakalufuxu.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/18654855292.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mb54jout0t43fra66oo3rgbpk0/80369366192.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32851ab0---mibaza.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/kezikapatema.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ripifidototamufe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c505fc348da---83273843569.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/35697432116.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c5d1b17b---fokovusoxog.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/89455451906.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/bedefulusojav.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/7601951417.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4514add3293b53b402b037130df0774c/7477263285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=basic+engineering+circuit+analysis+11th+edition+solutions+chapter+8PDF link annotation
    • 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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 18212 bytes
SHA-256: e038ce0388a9cd0666f06bd93a85de86599370f80fe93831ec8a705a7a80ed5c
font_01_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 11320 bytes
SHA-256: b1ea1e02da72f5f6e8291f83df60895ac5d93007eb5a39461033f5371c10d2fe
font_02_sfnt_off0001473f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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