Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a07ac035a49641…

MALICIOUS

PDF

94.6 KB Created: 2021-07-20 15:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 745176acf4a63fd25b5266f611b61cb4 SHA-1: d7b504e1194350cf90e308101124c1de59d9d424 SHA-256: 70a07ac035a496415fa8738cefbf94232ca41ec57be34694e3336edb0e906fd7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host malicious PDFs, likely intended to lure users to malicious content or exploit kits. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3f0c6b16686729ab4d1dfa6db0008e40/83905202309.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a400f2ea2e9---nifajog.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d0b4753b1071c78b4a8ab02f716568f8/sogeju.pdfIn PDF document text
    • https://red-adlay.com/upload/files/83707690572.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16089320907fa1---refupasa.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/87315171859.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba673bec6f4---46712092124.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a790c007d---degikaxamubekofelegiser.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/68476001647.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a5c811f2---laborenolugeteb.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/latole.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15d1a34a9---85647577682.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zezov.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76322915175.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608394853b636---jokuridebofujo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/geselixoxekodaxumufemo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb230b0acae---47094503981.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c142c3b77---toxuvetatixejosuso.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/babonijurazitotojemi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca1dbf01a---kovatuteluwafufip.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106180922564906.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/vowetagevafin.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/39365999559.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/84690808779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+pizza+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_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10468 bytes
SHA-256: ad9ec8e289f9f434a02c5517e055e29f9823f093a16335c9192c610910ab7ab6
font_01_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 17896 bytes
SHA-256: f32f14f0246b9ee837d541744c5a490ae7b37fff5e1074d9e40c7767b0b9a2ef
font_02_sfnt_off00015526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1