Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f2e6d0609d9fa3…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6b6a94446bc92e2367ce595d0408cb1 SHA-1: 7ac2b2358114481c5cdedf743cac9c5ce1193783 SHA-256: 15f2e6d0609d9fa3ea2c7d67dacbaa1523e6bd5f676e656d202c211676341893
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised WordPress upload storage and other potentially malicious sites, likely to trick users into downloading further payloads. The presence of a 'download' button lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad8b7db05---31483561736.pdf
    • http://flygarfield.net/userfiles/file/wozikatuladewe.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210725_214839.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/700e657f7506101616fcc04902acb205/91059464029.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tcpacc6tvo8pgb933db4f70k1r/bukasemefotewefetadupaw.pdf
    • https://bbpartner.cz/userfiles/file/80122627310.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cbf4d725860859dcc2d56b91af0738a2/wusepew.pdf
    • https://aduanaldelvalle.com/userfiles/file/wenirigoxojatenetibeporo.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqoqa1re58qoa6sa84fvoep97b/5476039132.pdf
    • http://tvcsoltau.de/userfiles/file/lekiwuf.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bf05e35a---62581112702.pdf
    • https://accuratesearch.com/userfiles/file/sinopanigerufesasi.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7ec2331ca3f65f31e97ec5b241e88592/ziwodesugij.pdf
    • http://notarbrazda.cz/userfiles/file/89719099429.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202107292206372917.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09549defd---lufusuwu.pdf
    • http://shimamura-mail-order.com/userfiles/file/zipureritajapetaxopago.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9d596e8d---42449009952.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/cdb5c65fba274a24f7173932301022ba/30352692357.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d0b0df51b0fe4e664bbc36ab6c603f9b/mofekupisukujizesab.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a23dd002---32350951083.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fc55f59cd76cce081ef4d1648744ca11/20343957027.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f331789---kexovufozazowifakev.pdf
    • http://centrostudiapulia.it/files/files/sasumazejisomek.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/be5365d3743abfa9159520a3b3d86ed7/zujup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=neet+mds+syllabus+2020+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
font_01_sfnt_off00010af8.bin
2caa49219922e819412f0b6332a6b5df512c18197cdc47c9fc372036f2d8e94a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10816 bytes
font_02_sfnt_off000123dc.bin
66149b1ff5ac94d9d2fb39da558976dee7b1e5b880475b0c03cdcd48d9806934
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 17280 bytes