Malicious PDF — malware analysis report

Static analysis result for SHA-256 a965fd786bfaa569…

MALICIOUS

PDF

91.4 KB Created: 2021-08-03 11:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6b54745ea5ac9341fca5c019e1c362b9 SHA-1: 1baa052198b00940359a6a515c54b126328a00d7 SHA-256: a965fd786bfaa569c9cd1ad66652acfb2c88238806629abf852d17a07ebf4a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an intent to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1db4355f---4956033218.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5f5ibko90l9a6hvb3jlari86o/55940459338.pdfIn PDF document text
    • http://getvisa.ru/images/File/87124626895.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/susuzojisevobewes.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/94978024704.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/vesusaw.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2b977594---90430360519.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vifosetasatoz.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088918013515---61841643346.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3760b7bb---rovumi.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/419aa30c3d86d98a6b710d1c4166a142/xudezefudur.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c9922758---56768065541.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103a409becb4---48833474248.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/35230550375.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/nikuvikivebabevumu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087f986b03e7---kitexebarowevikitupogiw.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/9625221222.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ba175a6---ludaxavazitotid.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1f16a06---rakaxamikilituwurimabiju.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/rixunirowedanedaputaxogol.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/puligaz.pdfIn PDF document text
    • https://migger.dk/userimages/file/45205883142.pdfIn PDF document text
    • https://akemi.ro/hirek/file/kebupadetorumazeninarukix.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/povatuxebasovepigejaraxes.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d22c1c6be62---42248993572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jazz+flute+sheet+music+anchormanPDF 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_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 17404 bytes
SHA-256: b8ea5c4c9166851131ccda34749d9b84937fb6477534b564a80e086345ffa0a4
font_01_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 10752 bytes
SHA-256: 107c0884b8f285bc4a50ca137b6b010ede1cfb0b86fb6f2928677fb987cb9105
font_02_sfnt_off000146c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1