Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaae691185277b3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 17:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83b52a2db742903851cc4951b4b1e2d8 SHA-1: d69cc8f3ef476674cba8e6e26e57b5727412ed10 SHA-256: 7eaae691185277b3a4390a2cd984b5625ce727ee2ec9faa70792f9dd4ce5a0c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The embedded JavaScript stream, though not fully analyzed, likely contributes to the malicious functionality, potentially redirecting users or executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc5ee2a8d---41143238958.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3d1092a---juwidezonokejojefabevuta.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifofit.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/ronodesofopajuv.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/79047535017.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94026753413.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/42054825320.pdfIn PDF document text
    • https://kaparatt.com/images/File/65463520142.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_070938_127.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/jepezeselusowu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pajusow.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mabipatobujowupimalenikej.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908001821.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/42268317672.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fimetelekajowofefe.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/52374329753.pdfIn PDF document text
    • http://fgosvo.ru/files/files/bajitajije.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/xujarolikidepikas.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/rasiragamizaniduro.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/80adt9f4gn6n32g1n7i8r8gpc3/83450593168.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/48629373933.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/sagefoweroxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=decorative+curbing+near+mePDF 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_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 15740 bytes
SHA-256: 3358275e2289f872a1cb37112512c7cb29878de1f7ff043f2a9dfe31caba7f0d
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 10668 bytes
SHA-256: 34bc0a4b21ef2cc51aba4cbdf787006975683af26646d0b1b1bf1f3325b0bb48
font_02_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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