Malicious PDF — malware analysis report

Static analysis result for SHA-256 e671cacbebe3c5db…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 23:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3784f8008d7d8c826d004e6df67671e2 SHA-1: 45791a89ec5a5f08383d460b0f00197cc84bc2ab SHA-256: e671cacbebe3c5db7a39e1bd0e174107ee751911665d56445e52c1ec63dfe73e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=callan+method+stage+9+pdf PDF link annotation
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bcbfa2ff64fef84fc5e5ae13882c92fc/nupazonojavup.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092080fa06ee---11154261063.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/welupubepukutasexutile.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3aeb97dfcf43e01dd224155a538757a6/gubidotodepixunovepolero.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e94d4380b240aa2b41ad585a7f010842/dafuz.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0494b11e3a---99572458177.pdfIn PDF document text
    • http://goref.ru/files/file/53005241533.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/42806329612.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987d73156ef---pegofebovevekosoxurekof.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/naxekez.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/17270092636.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_9CA160ECCD212460.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/59861376250.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806ba162b56---jifoperepozij.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a943c86b476---tubewalugini.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/42033991804.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210628142346.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff32afaaab7acddd49c126f5f509921a/12562886895.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/pqdoh573jg1otba40vkhdb04d3/zukixabebutapusuki.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57185393655.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8to9lc6lm6eg33k3g18a16hjjl/nulodabibu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/14dvhghh690362iah5o9v3tg3o/94584318461.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ht53ffo2d63n71ntavsco0im8t/pazavogomatosoxosi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/43101736015.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4ad77661---pisatiwaj.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/kikijojitegurelitanifiwol.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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10952 bytes
SHA-256: 131e39ce75e720bd78f72d39790e726612d5eb305b1e7846b35c95a96040c996
font_02_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 18848 bytes
SHA-256: 1fba017d59de5b045646a813b884ad85c07824417b798a681f1366e6e61bd966