Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd2accf9781fea7…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 21:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 337580ad7bd206920217e40b60d09f78 SHA-1: 418606cb23edb6a2eee1fce2eea7aab05b75910f SHA-256: 9dd2accf9781fea760e2abd8645491a1c2f8be44569cb05863a7dd3d5a9e7c88
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alternativecarrepair.com/userfiles/file/resedakumojibopamola.pdf
    • https://bazab.ru/ckfinder/userfiles/files/91354463204.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c78e7327b7e---kezeluvafatikem.pdf
    • http://grafichesirio.com/userfiles/files/fosotip.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5b7fekqbl6nlbtlcso0ku0uq43/fevezabizimidukirirazami.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777439b338---60991028819.pdf
    • https://zold-kommando.hu/files/roladudepoxulalosegos.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6cd9a1a65---wajirogibux.pdf
    • http://lyzjkgm.com/d/files/95374318678.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0ce6ba42---febod.pdf
    • http://engroupe.ca/aym_image/files/sijatipexanep.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/3e511e93661457fa6455e00d59fb3137/ragusan.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5ngf8hfrdk5m03jgcvumctnbh5/47726897984.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7b3fe37281f82a829fc930b6a8f34144/ramesobopitubutokizuruk.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e4b5c145---tosoja.pdf
    • https://ivaco.it/file/vegovagesorib.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c9c862018---polivesurexiwiro.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cvluaeubtpkkmhhsmdr1gmphs7/11848690376.pdf
    • http://www.findvoters.com/userfiles/file/15908395732.pdf
    • http://elm3rad.com/file/67015540367.pdf
    • http://zkojicin.cz/userfiles/file/94778757449.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8ffa230a9ac40e7f630db6df887537f0/gilukibadazasid.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa2848581---37968553929.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/rugimekomil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ruth%27s+first+christmas+tree+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdd.bin
a2c052fbf8c6c3359f6e6df4f4aa459dbc7d582476a9fae8719c98e77abbd4d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16924 bytes
font_01_sfnt_off000118a5.bin
35c1312bcbd95ba142120c95d5a8fdfcc823def8c78cca939c852921a47736e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 10792 bytes
font_02_sfnt_off00013194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes