Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f8dfc0e0590be3…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 16:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ca5353a0e6e0b09fd4f76b385ce9992b SHA-1: 7f7f8d9277119a82aa995875d34f9e5d91a343d0 SHA-256: 27f8dfc0e0590be3c35b6bc1696f38d26290bbee269fdedc9cfbda724e3579a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://huntic.ru/uplcv?utm_term=ap+language+and+composition+exam+format PDF link annotation
    • https://n-v-v.dk/userfiles/file/6036667821.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507024719_2111489591.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5daee4b334206165f81a690dafa624c9/fakigora.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/vumagutukub.pdfIn PDF document text
    • https://pmms-online.com/assets/file/katenajuxodelapeg.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/habbvbjnjun2hs5ogmp3li18hp/razitigurur.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fujaridovamubunexiv.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/furatiwavegulikesev.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853fbb4378b---jonedorurepigonodi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05cf55718---24594806370.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/70370586315.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/99025697309.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb6f35ef70---dexoxedaxubogiwinad.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cjl92ff9rc5ktjh529na3ugvn4/dinibukudozorijosozajoj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a173bcb4f5d---55156130571.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a597f4d900f---jusosixozumogakuwidu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/murenanujeguwunuboxo.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/45863607449.pdfIn PDF document text
    • http://tfforming.ru/d/files/lavej.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/021a4c7c5600c85580512be03e6320c4/fukanowubana.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/71410057214.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b758b65068770d0128c936d51289bc1/17852629012.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0a570a3d34c6efba98c23b11a34ef9e0/xixojotagagew.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93ca0231b7f0070a57f2c3136c2ea65a/vesixozukelifigusar.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 17348 bytes
SHA-256: 411f3c38e86d07a0b0c6ee18bd393d2d5df2a9ece0b6d32b2b0a532f51cfd585
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 11148 bytes
SHA-256: bb3bd7b40336bf93ed5e852861f9c60d5649868dc46842924e0799af29267edb

Open this report in the interactive analyzer, or submit your own file for analysis.