Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca497046b3af446…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2dbd9fd056db73661aa23e196e571e9f SHA-1: a3e1d123d3f1fe0057035edf390d8d03e58a0851 SHA-256: 7ca497046b3af4467f0d7ff2430de6e086260a3c802fc3d56476bbfe28b2fce3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. This suggests the document is designed to lure users to malicious content hosted on these compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d7a3689c---83942502425.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a00ad20---mibonefonipimifoge.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931c7ac4ce5---jovuzafetoxupamo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a2281a32---ruvakedix.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903c9fe8fc1---78219483298.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/42ffba4778ec5b03769fc08e1806c96c/14049011815.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e946771a3af---15662309155.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/joxufeju.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/1821477137.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/memitataberozizo.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/55159806321.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69692657447.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/72653818621.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/28690324439.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba99ab3ed---fokomaxekil.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e51e8f6cb0d---sifefimakinavo.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/tijanarivogalepogunivaxij.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nedarowekozanel.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f51ab110---70616490648.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5rua2gjj5b2g1iu5chig81bel2/43811296141.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/5435636388.pdfIn PDF document text
    • http://anpo.vn/upload/files/takon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=protein+synthesis+practice+worksheet+answersPDF 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_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 17684 bytes
SHA-256: 4a71790c8062356cc560431c4fd763769d3e5c2fc134daba9e4539eaad45191e
font_01_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10716 bytes
SHA-256: bcaf96b8e3bb4b116e3c5380e370ab370e188693eac0e5c36605ff9f68ea4032
font_02_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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