Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db34ba0d9b475d4…

MALICIOUS

PDF

85.7 KB Created: 2021-08-23 20:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79918f74f4e27cd75f17014e7c347a08 SHA-1: b7dedee4c53edd2b9d3f59b333250518b2b5c2d7 SHA-256: 4db34ba0d9b475d45eeb112d49705558782b34faa0e08e3c1c4159648f4b33cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c616cd2bb60---71233472267.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8sdjkgcpon6gp5to30c76rt57e/78550343381.pdfIn PDF document text
    • http://4bx.pl/public/file/63306282398.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608009d197b0d---kafabesuba.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/pisade.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pupubemiborupowa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfbbf70dfe---rexetukatelamuvojulij.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6552b8675f---lawux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48194cfb5---86529262836.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/janopa.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/25094998080.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f0a20d54---vanamazagapadimorejotedu.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/63677359129.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39a0bc5e2bfffed3b38d0e1bdbb64e3d/likaluxetebori.pdfIn PDF document text
    • https://asi-filter.pl/files/file/61453809648.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/21290949557.pdfIn PDF document text
    • http://shophouse.info/images/files/jamokuwenevelododev.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tofunizutoremopitojojiruw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b186985f9f---wewetidirowupijuxu.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/kifavepat.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/be9e8d6c5c7605feebc60a6bc110b9fd/94992883160.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/45514863574.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/40974182404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=amy+ryan+the+wirePDF 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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 16852 bytes
SHA-256: a86efea71e35ad2888cd204ffd1d6f5eebc1af4a8d5c533099335b431d48cbe5
font_01_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 10220 bytes
SHA-256: da8fc69d03881fcfcd3d2cea5d736a6c5b6b6cd23ef8de988fe1be11d863ed2f
font_02_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1