Malicious PDF — malware analysis report

Static analysis result for SHA-256 a793ed19f938a2b8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1fd6d30dcac754f01f2024b96940c1c SHA-1: 8118d4e9f72c3ce2fc20bb2a5eb877bac002894e SHA-256: a793ed19f938a2b82652b3fbc6dca7e325b9cc58bf66869701e43a1c8057b58d
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 upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b07e90b0---julidazemikofogi.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210915_45351.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/82404978842.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/24487507032.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/11272846451.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/teraxevokafovebawo.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/pekubaka.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/88450780772.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xedigawafeto.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/23260315391.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wukuzemalatufozerufovazi.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/64625634037.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/sikatulekanekod.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/2464129716.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad33e8bb9cad2b9e7ba0671a991d538a/jeperovituveg.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31666156754.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/dufaparebigatafu.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/34392603616.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/suviniped.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/47029442934.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141f35159e97---texewopivusuravosexu.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/87008098748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=demon+slayer+kimetsu+no+yaiba+watch+onlinePDF 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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 11028 bytes
SHA-256: e7b831cf1e282a05510b4826440889020557c75dbb55b8238aae8e005c84298d
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 17212 bytes
SHA-256: cfd3bd79cf373445748f1f26ad359a1858496d0757b88e2e4c15e8458e03827e
font_02_sfnt_off0001305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1