Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc85a0818865f3b…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 01:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f4f553892be1ba24c62afabd74a1ed4b SHA-1: 0a11dbf6a5cbb2541cd2690a9b1454b1836850a7 SHA-256: 4fc85a0818865f3b1cec094f757897d0d69551071dce6ce378be25579e960637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for phishing and hosting link farms. The embedded URLs point to compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=cheap+tickets+from+boston+to+toronto PDF link annotation
    • https://balaji-technology.com/userfiles/file/fexutizufegujefivibip.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/20707e13278392651dbf283afce155a9/liregodufojisudovepe.pdfIn PDF document text
    • http://cjatkinson.com/userimages/doxogonetekojulibapagopor.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/19735461706.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12593593410.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7671f4c3---sexarubikepudujofu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-1/20210601085526337619.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b0fb52e0---32043378003.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/829t51625ob2r8nejdscembm8a/97676870272.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2c8112b906f3f2bb9852e8aa8866a273/6550599239.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5234dbfc---32530403720.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zuveputixe.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/06b17bd2a122e6830f149b6c8544a300/83342209910.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c2f75ca1095010e37eb666c684dd329b/95435934219.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4c450102eafb7d955e15f5bad9020156/xozunimonologojoberutuk.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/34112087024.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/bakobogelazujaxisululewo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c1bcd20c925c2846c862e414304b3fb9/4832792068.pdfIn PDF document text
    • https://csn-alliance.com/data/files/63736746401.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/zujisu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5eia421hjru3t7q6v6rp1q7gdj/14196224289.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/1j2ph8bh0jcn5lbfplugrj4fla/segokupetixa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/86680214260.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10964 bytes
SHA-256: 07a71d77755d94e2c6f82601730f4281d78f3bdf8d18f97cc592b24553c21fae
font_01_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 17784 bytes
SHA-256: 847b163ddcb9527dab30d858d3950620dee27c7dc04219a47a36054ed2f12d2d

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