Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56daa7f3a29c314…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 06:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7b1d56db95cd5a1f3e1dea398e38ec1 SHA-1: 62acd1c6aed5ccd1218e9c01a54184d9e4c6ccc7 SHA-256: d56daa7f3a29c3144b7d5d81e8e2c4b5affeb507916c30005622e05d823a5e3b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.pattyn360.com/upload/forum/files/97960647260.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2b240beed---70969431680.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869240c77c9---72872061867.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/7jboc26pm4d12vjeushvddf2lt/madizukafar.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ead78d41d68eb6c263027889136923b9/7529269016.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/xubiwidaloxojowok.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/mixepesenopopepifurorefis.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/penunuwalanupegunat.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/gedikawerubisoramila.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/93855235563.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/84781126483.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/87924647688.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/powegatudoz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612989dc7924b---vetabetosabuleridoka.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f366b7b5e---44801855646.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vulujan.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/nowugoxogapu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/59760743563.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0a32150a---99852241286.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/41103566328.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a73c11bf5---zojerulagosojutuwa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df808be87e3---61410837311.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/nidupisotubepevafe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/780b98ccb7cd158125f93dedfb333756/56544312655.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/858549218334a4c6e3ab1af9302c7708/kobobufibujagaviw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae4e9bf8d8---68980116167.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wuvuzom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jurnal+clostridium+tetani+pdfPDF link annotation
    • 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10872 bytes
SHA-256: 9eb10b53b5de4056b80ad806fb8fe283c1a27ab2fcb23aae5b8e8754afc01415
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 18432 bytes
SHA-256: d41a0e7741ffb8c3d1e8f6e3275f6f2775110b0af981b4128a10efcf1a5bfb1a

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