Malicious PDF — malware analysis report

Static analysis result for SHA-256 903f1230e443734c…

MALICIOUS

PDF

98.5 KB Created: 2021-07-09 05:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d3ee2a1eb670236f1ab91df91f2ef9b7 SHA-1: 855e2734cb2fa5fc060fb914d206780abf4cad3d SHA-256: 903f1230e443734cc956131f5e9536dc8f9807039dabf0de00620fe29134d072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aivieksteslaivas.lv/userfiles/file/78989264833.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b6f22a09---zubolojutivubax.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/851ced190e08f9dad2fb79e9a98dd1b8/mebexewutejakar.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/surabonasukejipak.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2ogs0f1kkvvr5fbel7to9r0gt/samufenoxuvu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/69222482160.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5041143b45---xisixuwe.pdfIn PDF document text
    • https://isosklo.cz./uploads/nikos.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088282de398b---48189327948.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mexewodupinaj.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/43143947448.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b4bd87e9---385062623.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6h38tdpplnt9cgo3da2jbval2s/86683726922.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/fugajosujuserizipofibadit.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4ou66q2qd6hvdkkp6ojeq32f34/xilukojazediforabowojum.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bcd953a6acd3982b4816955e9ad58be9/jiremafanodokozubidi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4e95kls9qudp33uliunelhvsvm/desizesoxiduxavugugib.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27a76d7f68---78879197609.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/pafitafupisijulupe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fe7788e60c---pikezezore.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7395811---kanuvapimijowaxe.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/93133093265.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/61741304364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=where+can+i+watch+lord+of+the+rings+trilogyPDF 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://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_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 18332 bytes
SHA-256: 29164c443d165352c57772f1ad9d8783e37a11f9019a7ca15acc8c05a287f850
font_01_sfnt_off00014e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E68 10948 bytes
SHA-256: d587121a17ce4a1cf177ff91e6aa4891b12d4a2c65e81876598c10e10c02d407
font_02_sfnt_off0001679e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1679E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1