Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38da9a397738e8d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 23:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d49f23812428880a58a51c0075b0551b SHA-1: 23ef315054f63599449199ff3ab57cdb204baa68 SHA-256: a38da9a397738e8d221a29f3e6e15a40fddd5c98aecc3c5ea5afaabe30121f7e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or other potentially untrustworthy domains. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45885680849.pdf In PDF document text
    • http://maydemtienvn.com/upload/files/83823318361.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/fagukatobojipogokuroxosip.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98520433f---16200954051.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a411cfbd---woteratalixifefo.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/xabejos.pdfIn PDF document text
    • https://olterus.com/contents/files/18748483470.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303012401da---93391715094.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/kilozisevigupuje.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/67109424994.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pamapagukepuvapo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/91581986718.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd15cf9d5---roxavirosatozefijezu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136274021bfc---wagezabetigobulin.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/mufafodabapoxez.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109150434058683.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16140e911a8fb2---jewafigemubumi.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/87047329216.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gejadozaxugefatobidobux.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/71176552633.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3r5kmg9hpf24hbka5fdedtf54k/kizakeluvewupokukesapim.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/97675751194.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=battle+cats+hacked+versionPDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 17896 bytes
SHA-256: 8fea29885c00fbb0b38ed47779f0360e383b11c9b0aa1de079db7cb2e7786322
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10676 bytes
SHA-256: 34cab8d1c90f57dccb2365c882d28e9e49f343e4a4b4534f799982b85b34a5ff
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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