Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f4416e57b01435…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 17:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 758f6d652bf2e551c27074171f255639 SHA-1: 4b8fb53cf3d9c0382e582491ac15356256901353 SHA-256: f2f4416e57b01435b4d27a77a33fba6284a25544533f073a2babedfd51381469
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=concealed+carry+permit+class PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40e603b97---demotagug.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zipelolopovu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jofapewe.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mubokirupobijunijesur.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708661f09b7---gavuk.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e6d868---87726820632.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/lepesusiwavavawagexituna.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc628f531---3431357492.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b16821c3d---gazanekem.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/91ff9ae30ee4b2b9b598a15e6e9c8dba/71570586310.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/fuvivusanujiwekaposi.pdfIn PDF document text
    • https://carlojans.com/cms/file/betefizitixer.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f968b0966---lusutijapeladisozofasoxu.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/16915153488.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/60632051679.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9bf0a830---98490383334.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ce60e4d56---zozafesujoguvaxi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be45aa52a4a---9217683669.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/bedobexenojubuja.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/17786092738.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5516b9401acfe5e1f626f2562dc320e/22074980378.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/15a3d5e1a7257c578ebfd8405668b401/18703091803.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tubivawokapororo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608926fe66958---boterobepipinuramosipad.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c1c9540222754b69375878c5545f8ed3/zoresebigu.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_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 10820 bytes
SHA-256: 91c68d11162f0b1853dff1ec340f9e26165c38a3af4035e20fc690519b22f3c0
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16528 bytes
SHA-256: 6ebe29e4051e0a0ce8efe5ea8f40dcd530e10b00b8a5165fb7721fe265e44ced
font_02_sfnt_off000136c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1