Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00d2bc790dc436d…

MALICIOUS

PDF

101.3 KB Created: 2021-07-01 18:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad7b0588bf909e2e5d2b12b605b34d27 SHA-1: e23fed939f73821649647c50391c20beafb0e6c9 SHA-256: a00d2bc790dc436d1e5472ed66b60b1205dbf8f04f2d264a7c26f6dfff6502fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting PDF files. This structure suggests the document is designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0295c5428---36780237790.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fac6271ba---vixagutomovafegesanelet.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/6434203326.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/pewudumitunasarunabef.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba344c2db89---wolopome.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/42jqiv79mdtt4rj89iokrcgbl2/27483792293.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074822f7b4---rinojamuleninugaxolev.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jupasawomu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/nasogipiviraxapozolaxige.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ef636047---masat.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d50fc8c06---3475343029.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/sonadubeme.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/42271971615.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d16a8c235---19408909546.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/64893dc0bebf1b765d69cf969fedd5f4/fudulepesaso.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/72324103460.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/53787912809.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/20644082975.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8b1c8728---bofafudizaxutuvijono.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/26819752773.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a11b848a6---rufefuxusujuwono.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/50919026074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+heal+love+bites+fastPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015318.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15318 28620 bytes
SHA-256: 634644dcb32086864bd7d8d5d1fd32574bd7efd8a750a33363d2f85b51dbb124
font_00_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 16616 bytes
SHA-256: 8e6ce498328615db9bd12e687eb1398ce39500133880edc8b156344ab2727def
font_01_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 10388 bytes
SHA-256: ef42026521fe25f17e61434a4759376474b3076291c8db9c1e1808bb49b70c24

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