Malicious PDF — malware analysis report

Static analysis result for SHA-256 d079a40b5c7dc4fc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 01:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43e4f052e92900d07b1a7e9722f4ecd8 SHA-1: 0c18edeb2fe2a1d509dc122d730228a0807c4e4d SHA-256: d079a40b5c7dc4fc30a4084d3f461a4947a8579717aae200e522fdfaf33ce105
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, but the heuristics and URL analysis reveal a pattern of linking to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/454119cfvsh1nh7el9a3u52pg5/64201837566.pdf In PDF document text
    • http://www.hussco-steel.com/husscofiles/files/gixukewejedo.pdfIn PDF document text
    • http://erex.hu/upload/file/25255928202.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/25363187095.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdb779acab---noxufejidarupux.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/buwomod.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609830dd049c5---wexutebal.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fisotuwixumiji.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/833bc14a3d8c317d7c5fc2086fd1688d/lawajumojoporenagupemu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2140258f6bce5acc9fc0368d421de473/5393008910.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/64318235867.pdfIn PDF document text
    • https://aedwea.com/upload/foto/putijo.pdfIn PDF document text
    • https://premium-house.uz/images/file/nawexexekuwumuvutobuda.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d46a8d2b974---53633572514.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce0b02db7---66258369460.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/batuxogofetumesovufasu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14881476166.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vugawunizu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/puzate.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e986567de9e---55178402667.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609850446c284---nevuzudoviwoj.pdfIn PDF document text
    • http://canvangdientu.com/images/file/65285567318.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210807160905.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6358d17b20---fogixanopirutavenosumemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chartered+financial+analyst+level+1+books+pdfPDF 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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 17344 bytes
SHA-256: 374bcb3b2acbcffe9b7c522a7ecadde81c7ab9ab18722584bc91885c7f226975
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11212 bytes
SHA-256: 874eeb89954179d5f787a7fbba177f65693915dcaafeb0a03b916c00ed61c52b