Malicious PDF — malware analysis report

Static analysis result for SHA-256 327b6d33b1522dfc…

MALICIOUS

PDF

78.8 KB Created: 2021-08-11 23:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87b560ad07f0df34f3d077b03f167aa2 SHA-1: f2b3f6c3da64d8593a79565a9100f13061be55ef SHA-256: 327b6d33b1522dfcb3900b7355b8940a4f4ce12ee6e22b43c1155d5908e61530
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly suggests maliciousness. The primary goal appears to be directing users to potentially malicious or SEO-manipulated content, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://daleel.global/wp-content/plugins/super-forms/uploads/php/files/uc35vrh8lfo572srv6oluie5sk/95789520903.pdf In PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/72613271017.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/19532851504.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fizotudazawegowomoru.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/77074749594.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pekakofanolu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8266cb1999---mojol.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/61621014798.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada407a2ccb---wotijufitajeposuwada.pdfIn PDF document text
    • https://bnovum.hu/downloads/30660727958.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/83473087911.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nujek.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/73231812759.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/losakosijelajuxuloji.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4c874ed25---32610456401.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ab5e7f163c58a0a9293d2417bf17318b/netud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/41ea420996ea7de7c4fb2fe1e2927e50/74767196377.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df60dcd318---91469562835.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/10520777750.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee6ebe7b136565a47ee33875f3e79350/sifidinumiz.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/72706022181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=elements+of+electromagnetics+6th+edition+pdf+downloadPDF 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_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16748 bytes
SHA-256: 6ed3dd9cb327156b166623e8ab4206db68077b08fbe3cb7722ec38bb450b4745
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 11304 bytes
SHA-256: 9246028229d095b4ae888a6a2b27b2aaba3d73f87e4c61ba4a3caec132e2dab3