Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31b2df5d95e50fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 04:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2af0e9aa38923461d2522d07e102cad SHA-1: 80ee999425b8614715d1499934f710b0509cee20 SHA-256: d31b2df5d95e50fbf122c6f59d3775d0b83df11665d573e3f2c9f08eccb6b152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external, potentially malicious, resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d006ee872e---sudesubipirarezel.pdf In PDF document text
    • http://wasserburg.pl/userfiles/file/80976794120.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zikubetil.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67b3012c5---3672017018.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5f6656d2632ece0ff363dbc4deb481da/68520878352.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/08ap314u57jdocaa7h8ukfm24s/48382544562.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/kumutijopivanaveviwale.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d64d6af01---dajalikivek.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/65166877855.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fpba4rllji5u83ti4900268npl/muxas.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbebeccec5c---94526606490.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/vojorosazazo.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-24/images/files/nudozibemudupogawijol.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/34949881734.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/musofelotodotokejaxo.pdfIn PDF document text
    • https://dptech.vn/uploads/files/muruwulunomunokobigazapos.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bb0d55c---tesawuwodoposozukofena.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57d17c7be---nubijitasof.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1ceba81d---junaxavovele.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/topagisagegigazadaluzapad.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/16948618515.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s9247avqsqtng84uhu81qjqvo1/19544342518.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/i7tfitabsfbilr9al03puqoml2/96456454097.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/184365ed7e9b2c2f11dc62a37b573bc7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=technology+then+and+now+worksheetsPDF 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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 17100 bytes
SHA-256: 1d56d1ace6e3cc492c5f964b80b619af6470fb805c63a384136a0313a5c845d5
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10812 bytes
SHA-256: 10ac5b38150088cbda0cbb4af2c8057b9dd30e6595816481c488c81d89be1efc
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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