Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6ffbe2fadab6e…

MALICIOUS

PDF

83.0 KB Created: 2021-08-29 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4dcbe2e0d697a49bd56c1c8a0095183a SHA-1: 40f2b7e6df07f15d0a68df38e2d16fb1b8e27a37 SHA-256: 18a6ffbe2fadab6e491221ff1ce7799efb42a5fd393ebb22a76f32db3e511650
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://wastran.ru/uplcv?utm_term=the+power+of+ideas+pdf PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qdfauc5l9bd7s3s7t89mb19bvl/buzuzotapudoloxi.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/ruvezanipagiwolizijeb.pdfIn PDF document text
    • http://unsersohn.com/images/file/puzotan.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3f1a0d80---lujolupadon.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/fovafoba.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/56927742834.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/86536626963.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/medubo.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/benekexuru.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/81548706846.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/cdbe64aea02ee1a4c7279b925f214784/toxewebupamega.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/84270433736.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/35810224479.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119dc18d87d6---44744493371.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/773tvmv3f0fmrigogu7hcgsbkr/doroke.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5d6d76892068e3b08af1bfd5671fe82a/gadipugemewezikejugujob.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893582abe8a---vomisejafinidikegozov.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16077496d8113c---fuletikak.pdfIn PDF document text
    • https://expomediainc.com/upload/file/pobonuxuro.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/35484292759.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c485b311902---82904120491.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/50598716914.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppv1j1tcg6cqn8269aou76ul1f/sodaduwodejo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a6c7d25df99b154f40987ee29c67d4bb/33744687384.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/17240756950.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/51455592807.pdfIn PDF document text
    • 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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 17492 bytes
SHA-256: 049f5c5aa9cd076662502d1162215f9037bd5e847ae183e6801abff0d3673b51
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10396 bytes
SHA-256: 8f81c45727e2736ace5455e629afa6727b190e40c597a002d7907d1fb4153978