Malicious PDF — malware analysis report

Static analysis result for SHA-256 464667d34a93d715…

MALICIOUS

PDF

167.6 KB Created: 2021-07-03 01:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1b144495392d61ee6bbdb87b7af87c4 SHA-1: 490ebf109ef6d3f0f38189927bd2ab6b74fdc187 SHA-256: 464667d34a93d7152901a018ace09cc7bde0589a5da0880d173f8810286a6dd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the PDF structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad039ab871a---66522468668.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d842c1263a6dcda5f9b7bd038ad361c5/92017763870.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507053048470179074.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/set6cloqk6bnmdq28dj7v8dkd3/mupoper.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884502c51c3---xidinujezifezasetemedosi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/gedomomatujokopitugap.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/nivebuxitetabikuvides.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fcqbgiv1838lmbouqgsi3u2o9m/wexinoroxodu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16198935972025.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ce51292a12091e458636be5ab5e6842b/53412785487.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8627a95b---77455283478.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3233c3e1dd678b33242e2678113889fa/4800610250.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/do3nud150t1j52j7jpe4abo9g8/xilidesezabeduvususubuxo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9781c534646f42b6c6d5712f6b771ffd/pijexa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f4c6c9f7---ladepivelixozidekoroxuto.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lu1sdn7a3ak30m6o0i9bsac1g5/vedolumegotaxitu.pdfIn PDF document text
    • http://szwygs.com/upload/90028120027.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktaahhfv5ni3oand3f478isie3/nimaxalarawobifakawa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8c3070afdba1221da263297432daaa44/45871334041.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac1906010---20849505652.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b750797bee6---zufiwotikeloke.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/anrkddfk275mebvdnani9rms5f/95706413742.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/db0a92a65b3eb4567d9f7bcaa96c6c1f/4114464065.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a873ba2133c70ddcee24d9b2f5cbc2c3/gekejigori.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/titu94u5i8mvkf46seouv5l41k/tonebiburuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=medieval+religious+musicPDF 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_off00022b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B10 22004 bytes
SHA-256: e2d0f09dbf3db3374d80d1164e414b4111801986dba0055ed0ac3d37f0d44423
font_01_sfnt_off00026072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27889 10672 bytes
SHA-256: 2059331d82ac68feb58fd4ac380c4735c2c3f7dac012c4d438dd45f6c102cd1b