Malicious PDF — malware analysis report

Static analysis result for SHA-256 045134b7ec19f9b2…

MALICIOUS

PDF

93.1 KB Created: 2021-07-23 02:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af1f7c3a53db5de82e9d6a01f22439e SHA-1: 1aad8d23f0b7d6bd088cb8b2ea5fdc12d32657b9 SHA-256: 045134b7ec19f9b22e77aeca6f3b80c19db893a8aba8b9137e99f168a04279a9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The document body is unreadable, but the presence of numerous URLs, many hosted on compromised CMS platforms, strongly suggests a phishing or malware distribution attempt. The file likely exploits a PDF vulnerability to redirect the user to one of these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://arcdesantmarti.com/biocop/Images/images-editor/file/75542631184.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7bfa4e55---gevod.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/48700401172.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/livov.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/nobeg.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a2f936765ab8848db59699df1cf8da8f/42180758063.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jupomogarunimoga.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b9fcfbfbabb9f6edc71d93c26561542/vibifa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c113b52dea4---dewofu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/saxevuxugigetaxak.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xowepurodipetajudiwojip.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/41cc6cdcdf9229ed916c9faa158fe5ec/fumenaloxuzef.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/203d8b8e340e45e27b99e45a41afe661/gorerosipobotas.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/90888654738.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c4f0eb7781af61e5d656b622cdcaf491/sexum.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/kireluxuwomakiguvowatoj.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f02ec513b48477f47e509b8619e3dfd/zemasafupezezot.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67ca191c7---fodotepuviwokivij.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f86ub49ik5fmghr7ib6d4jo25b/kuzunikawefaradanefikev.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/jixenuvumuriz.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xonosof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=benny+lewis+chinesePDF 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_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 10100 bytes
SHA-256: 51c4a4bfb0c0b69a0689e70e65ce7b1ba29de4f5086dd55e5dc8e18412796714
font_01_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 16892 bytes
SHA-256: 8891a819af2b9d0c46e92f3a347e4f40f981cb545542d49c2ec9e61a48f586c0

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