Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b972910e2ac2ee6…

MALICIOUS

PDF

83.3 KB Created: 2021-06-22 15:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 96b16de311ea3b65bf16c1d1620aafeb SHA-1: 1c3d6b0651e4439b5a57e7a35bb923274e17df96 SHA-256: 6b972910e2ac2ee630e9011b2dfe78481c2c6be73d993d9bb1f2ef54a6897f04
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://asupuro.com/upload/save_image/files/sinexokokimomup.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/94cb3ae370271a7f7bb3425922321ab0/voxodozodilodi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202a3e2f03---35980387404.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ditad.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/luligozawiv.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vonunatazagog.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ghcqnvp5dqtbj7kfajh7rp2np2/lelebixok.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd41bc5534---favisiwunadaxesomasetikaw.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/14514608407.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qfi33nvtapo85r47rced06ll7i/pufonuketixina.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/65960666098.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160827be9e60fe---70725652411.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/17a51e0aa00b3e68969fd18fb373844d/kosafini.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9mncd8cp04r20cki2t74c940ki/vawepazavo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f7bcc0309eadbd45cef01e821fe84581/17779979429.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xamozifufizeloponusewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=djpunjab+gurnam+bhullarPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 5268 bytes
SHA-256: 54dcb9d69f9aefdc234473db794feacf21cdf074b66affb1386fba8c1cc38338
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 3624 bytes
SHA-256: f555dc1d6393c41ff2ad0c8adb84e09bf49afead7c2554097260b329e3a2cdd0
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 11324 bytes
SHA-256: 039d44d88180f3d9a37b3763b4b25020eb6506c44f107712518fb1300c60b808