Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d10904f7217be4…

MALICIOUS

PDF

97.7 KB Created: 2021-07-03 15:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26b10fdc2b941a11f84e6d39ea130f99 SHA-1: 882f5be444369365f9004948b6af1d95a69862a1 SHA-256: a1d10904f7217be44adf169b57ab29c721e482955e29c5dafdef238e5e261b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91789580132.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8cc28a625d994ef8b60e3d24fac032d3/newixogipa.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da758473ff---jisinowakolaziroxifojiz.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ralobobiwosiwutud.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///41354533474.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac6509061---xanimuxaro.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3539d064---28039383316.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/30341908643.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f592cc24---burudazozadakifafe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc08751cd---forosigedap.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/778539220c899ddebc5baab5d8101010/mejowipiduviwolofebab.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/21471218043.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714abd5d022---nebobimun.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/tedatikewu.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/97331863447.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5ecd78d377d7dcd8357878f0ee339670/xalulefosokalofolegarifen.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/74834e7627921ee99bfbb57c2b35d488/puwosejidilewiraj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8bd28e04aa6ad8247a3ea8af7d37f885/57934618791.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd26ba6c3---59253578789.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf22bdd29---88923371071.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/38618516748.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b06a305a9---rabokabasu.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pejekejedunidevugik.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7d2ca019---mipamatobupeverel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=restaurants+with+outdoor+seating+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_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 18244 bytes
SHA-256: 691973a123fa7fe0b26fba659a3e1a9ff13689674f0eda0237fc4ae6a4924c18
font_01_sfnt_off00014863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14863 10880 bytes
SHA-256: 84b22394b0e43f1cf9c3022042f5d8973462ddcbb31988e9beb25b79661222ef
font_02_sfnt_off00016139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1