Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ea847e2be916c5…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 10:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6add921a69691bf7de1fdfe50dd7b404 SHA-1: cb92d5f9547b30aedca503151c60d69a8bba1384 SHA-256: 76ea847e2be916c55f7ec7fa4b803b7a0a8cdb9b140946f4bb43dd1aaa1966a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=it%27s+hard+to+teach+an+old+dog+new+tricks
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cad67c0e3---81597508383.pdf
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/62214557593.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6ed9b7f6---30131843128.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bc27d764---feguwenij.pdf
    • http://jnnycc.org/userfiles/file/nisizugijimilogukaw.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/hbis0mneck1f49v2iuv1hg25d0/88076683262.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0be389d0---leraw.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfdaf1bce7---linovojawexunil.pdf
    • https://jagominum.com/contents//files/dufakasufugomi.pdf
    • https://cicadit.ro/UserFiles/file/68866243679.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1191dca06db78b9b04dd3dde52257aa7/femarowovabenarip.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4vq2qojqc79r5jlauen01o8qd/rufekezuf.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/13cad2ab6bc2afa1afb1695fc266dfb8/luxufar.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h7ks4kejuo11315hqdcvb1lb07/dukotup.pdf
    • http://rurisnet.org/images/file/36761056181.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3e6223c20---68954359976.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905a4b0cca7---52790007871.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qlej6uu2451058vsa7590qb165/kapevogigijapa.pdf
    • http://maility.pl_adresuserfiles/file/47369568026.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160761f3b091be---5329720339.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d5tkeqtd3iuvabuoi2rjggcph4/gikeluponel.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/00a752a1d2fc913c46fc55251134f2fa/2110971758.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_off0000efcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
font_01_sfnt_off000107e6.bin
3356d76c40e00783434793a1e182e0313390883076f4ee42dc3c99a9fd7a3686
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10812 bytes
font_02_sfnt_off000120a5.bin
f9ae4246935ab1bbed3db906ed321ea35f1b33bd60923df2fd9021286e6003f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 17804 bytes