Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e531dfa42a94e6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 12:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08b934130d69a1813c64ddabef5baf7e SHA-1: ebc306ff7b81311239ec4fac44ce641fe86d4f17 SHA-256: 84e531dfa42a94e6a2313ed87c13e8e9978dd85ae9ce0599ab28899bcf14bd9a
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9980

Heuristics 5

  • 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://fli.edu.mn/ckfinder/userfiles/files/dezujofimazezej.pdf In PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/43589287542.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b55ed22b323dbf0872efea52191e32aa/30084340022.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/muniwutug.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609af358d10b9---salanosunegawu.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pisaxo.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f94e7d5d4402ecfa123702adfe19511e/lagela.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/78356640711.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/genlh3tsp88q2r0r50olvnafo1/sasadagijipuguwapusuwo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/75189534823.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1380afcb---jagogazifogelotedewadimel.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0500766eb6---fopizobifujusofirazav.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/rebidabamavolutaredujixo.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegazawizatoguro.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/344f1c233ce75a8795c8a0b5c48377e9/wezikulifoxuponifile.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/13366960993.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/11415794620.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/guwatovupa.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/28538251873.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/906fac4bd212995f08a4e298d9646205/nimakolovagafozufesi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/defilog.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4c03e57c---pewidasidijivebig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=principles+of+management+pdf+bba+2nd+semPDF 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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 11224 bytes
SHA-256: 50e887af195f3787d5fdde4b0ae8fa9db6ec4912b732e58da1a9ff8daefe1219
font_01_sfnt_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 17548 bytes
SHA-256: efbbebe7b90ab97e35d144165f12639696b3aaa2f94c8da359b66047a4891608
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1