Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7e84ce3eec436a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 08:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 055c6ddc43564cd544a562861d6d3a5f SHA-1: da79f4dce1dc05f54798b4df56835a85a5b27191 SHA-256: fa7e84ce3eec436a264d81e7e1f5764d08028cad5aed5224fa5a9b716984fde7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stancijanegrin.com/UserFiles/files/zubizirepunejijafoj.pdf In PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/bewevugepudemijof.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e171c621b0a33bea90199530fbbc0f3d/39470033981.pdfIn PDF document text
    • http://zenithmetals.com/files/fotojazebak.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160859171ba462---99110823894.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kujamujotaralizirazotu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2460379637.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/92464333215.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a28768089033f93a41caf85f10d7d7cf/87627349495.pdfIn PDF document text
    • https://limmaginebistrot.com/file/fokijuvisa.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9affc10298ad320d3f2e0d1986740402/9345806860.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c273e5e6848---sufawufevo.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/dapaxiwegijesum.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6lesijq2hs2e9hj2fgvcl0535/xawosuruv.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8a9f16e0---gegotojule.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/sadapepobelowagajot.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/re1d8idu5bh20oi0u373gvnuon/woberexijef.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8o2m41i1dto1or06nkfh0use80/18556908239.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f2277c4c62817af75259306da989f39c/20852150523.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/25347142950.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5c1750cefe7e04e02330947033a1248b/60720958369.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/nedegemuxugexivusamodaxa.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/89881223443.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/70722459333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ielts+writing+task+1+and+2+general+pdfPDF 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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10852 bytes
SHA-256: 4b1fd870077ac8b74e57f90185732dab52092124d15b18d50fa58a2417c41054
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17500 bytes
SHA-256: 9ab947227afd59df5aa4cab9b7dac8dd2891456584c006f981852f60da76c1d0
font_02_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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