Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4bd87b657e6a97…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 21:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3539e62488c066b0200dd2a9edbf6e1c SHA-1: 3ec5a7ac04f1c6fbee49ca9e2a2fbd6388341cc5 SHA-256: 1d4bd87b657e6a97d16e44d3e9ad27886baf8443e9b1d2f7595de2a62445ddf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links for SEO manipulation or to distribute payloads across many domains.

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://synerhu.ru/uplcv?utm_term=lithoclast+master+manual PDF link annotation
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/benitugisimowilo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/01e7dc4c3db314ce20c74bf760f280c0/46951662681.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b15dc626---27032708551.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/18928271684.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb4e7525c---63316387082.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6nfphfehd3d2c880uuiia3899s/bufelofovepiwisokoxibi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/rodeguforagedixit.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ae693f6a363---mesinujuwoki.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sbprhru70t883uqnlnktpbkum4/jatetunejijitosozogur.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f17f98c7d---renuvometuxiwofezoju.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/7562843724.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22bc24576---nosipapapu.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/fugamesofefusewodetut.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/53731441080.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dc551578cf4d56059ca87c17485d4add/5502336266.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fe99b1fe148d6e01934761958f16917f/57337779404.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kibeguwuwuwifo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a6e182fb---46478668813.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e5ebed44---92280884604.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/plki1a8kktpvgogj86gp1u6132/ribapof.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/93183395268.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7bdd840ef8aafc1c608a6dc3da04ac41/62237824144.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10f85412530084be93bde0a6c04d8434/zegajidaxisari.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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 19764 bytes
SHA-256: 4e223497e36caa6da0142f088be18f3e4a561fda4932964c5d8fa676bc97877f
font_01_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 10552 bytes
SHA-256: ca1c243806110e83781a31a556e8dc876186bfe55d5e1264be25d6d5f3ed9e66
font_02_sfnt_off00014edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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