Malicious PDF — malware analysis report

Static analysis result for SHA-256 203b43cd073af88f…

MALICIOUS

PDF

82.3 KB Created: 2021-08-23 19:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d54cfc9bede0add186456fbb85815773 SHA-1: 6d303cfce356f23998b807799fadec8e6f7c193e SHA-256: 203b43cd073af88f0df079d7a651d3ae78b8201326de2540f4cc91765cb63588
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9ea3ecda23483a18040dcf178847de67/joxubesozakexenonopok.pdf In PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/xotirikilojojogixop.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a4f6310fbed085fb62a7316c83495a0/47246660376.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/008647cc3c3d97818da913d8dfb51c42/50400635436.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079e98e896fe---wisukubaboveja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d416e0ceb---jasesekakugara.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0f8ef2b49d2a6361798df5fcd5b225af/pabiv.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/38492654459.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/vomijovojadexa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7ddeba5c---tebidego.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1b7e73e69db02b0628f082dee4e7c17a/gimukogogibiriwax.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/37722437632.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mnuvqqlrtsd07mm3b34iltmj6o/13181829331.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/17820014718.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pexinabavotikukur.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb643e60b---sujerurakuvo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edb0d9d1f---35398791407.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/biraniwokukonojuzuzak.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/dupumomewawevepanub.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/8303986118.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/121cf2a23a3eecf0addb8537e2197830/8855606552.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/83453163459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=head+shoulders+knees+and+toes+chanson+2020PDF 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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 17400 bytes
SHA-256: 7242a43101138fb4ad25ba2516b9a8ea2973aa066be2f6206eabe002867f0aa6
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10800 bytes
SHA-256: c6794919cdfe937f9e5458c36e9bd6fe1f3d940af7cd801f6260204f7c9460f5

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