Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4da18713e4506b…

MALICIOUS

PDF

85.0 KB Created: 2021-08-24 16:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd18e982da2d4aef4036cac4739361e7 SHA-1: f8cd27ffe7f04ecc839ac19fafcd59825964427f SHA-256: 6c4da18713e4506bec0a33cdd55bad3f28d797ca308303d366726e52c5a53641
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=when+is+season+4+of+miraculous+ladybug+coming+out+in+america PDF link annotation
    • http://armanetti.com/images/35478581736.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bdad22d84---80112681845.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5lv1vjlqrmfpt4a7gk3panqmoc/tubuwosojilemumaku.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g8jsubk3782iomo9n3blab7ia0/vorowutiwowagagomubo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xexujeziwixezobezig.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/novutexupezorex.pdfIn PDF document text
    • https://capecoralliving.com/media/file/duxorev.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2cdead83---fobajifepotajafojepag.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/fogebatotabutoni.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/56680774628.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609814ba6b66f---94021821825.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/44430661428.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77371900362.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4fda60b2f4ad35e993f9f62609f4ca41/jemorupina.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/jajulegebazeguvosulapev.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28354243934.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/33920192266.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/bupovos.pdfIn PDF document text
    • http://promador.pl/userfiles/file/47933131899.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/5822800018.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/ninojetinuw.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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 11348 bytes
SHA-256: e89e3a102e0e7d4947714627d64ea2efedbfc1042936441d554f11e322a24387
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 17728 bytes
SHA-256: aa1d38807d7f76bae872867542a9387e54220af786cfa473564caf2134273815
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1