Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c90d736f6270fbc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 14:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f212030f2cabae39aca71f636201ff4f SHA-1: 780265d5241f7b44c67745382a7c37bcd0d2f0b4 SHA-256: 7c90d736f6270fbce9007363c99f24def38c027ed1470aa34667c6cbf81ac4df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other suspicious domains, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=kepik+hitam+pdf PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7806e09034---denubexotumipopezatu.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/zepokagijarejibon.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/3412097956.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pefakokixilojusezuxo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/wadap.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a0ccb6fce---levutusifedaruritekuga.pdfIn PDF document text
    • https://phr4u.com/files/69513867981.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/88chvou7btqjoqkn4lccjet1ve/fafis.pdfIn PDF document text
    • https://senhewood.com/d/files/mamomaxufolutabuwixa.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/xijinidujodaza.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vetuxadapuralidezoxenabut.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/suzatatavelifutikira.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/sewapim.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/12432729809.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/mosamukitiwib.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e0735aea3bf17fb1515293a2bb997583/64425807424.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/10d3bd3492ca41d764fa1842331fe9e0/mejetetujesusezuxoronoluk.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/mepataxapabewewajiv.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pep1sf0onr2ahsd7jvrevgdk10/33125087537.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe07b24ce---25388998714.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cl4st5to94ha9gebb8rcnmkgte/fasoxoj.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/sibofukosedew.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625126664.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/31719677843.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/56487715069.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/69731884528.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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 16360 bytes
SHA-256: f500984c3b2601afdb72f508991f70a2efb2aaa07da9a9fbdc31b2dc297a8175
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 10308 bytes
SHA-256: 6585fb8e917ff4cbe331d8abca6461bff620cf5337e648464ff8d4db4b0218b2

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