Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efceccaf8d80b7b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 16:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c2d1a0c40048e47275e320d21caa94b4 SHA-1: feb3092c8305db0b94bcc20724a054048afc7b0e SHA-256: 5efceccaf8d80b7bbe1a2045682a98a569596ee16fef675004280c3d3e6786d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple unknown URLs, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The presence of embedded JS points to T1059.007, and the likely delivery method via email attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109111217533160427ha9kw.pdf In PDF document text
    • https://mariellatriolo.it/public/file/1951868788.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/14940322282.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/24290877802.pdfIn PDF document text
    • https://afma.pt/site/upload/file/7173285241.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2073194779613cc93c41fa0.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/14054397600.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ef5fc8016b---71186553320.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/45544840798.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/79144422553.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zusosoxifamodogebopak.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/fufodewetazat.pdfIn PDF document text
    • http://standardamulet.com/files/files/xofofupoviwotorobowiwikif.pdfIn PDF document text
    • https://12waktu.com/contents/files/94677957778.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcee3b6777743a1df177abfa4b103e2c/73717346738.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/89892961863.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/murubixab.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vusemalinovadubi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4d4mu5nr1ttq11g9crtjsht73d/80783239672.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/57790897904.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/65557732560.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/vudif.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rewug.pdfIn PDF document text
    • http://electric-kernbichler.at/nuvonasuropanikogirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=why+are+iphone+videos+blurry+on+androidPDF 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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 17804 bytes
SHA-256: c8f9de5e10d4ecdb198b285cec88f6c5e94315d1d3e70d37750ecc2770b1bd26
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 10804 bytes
SHA-256: 2fcedb72c93e0cdaa689ae2dd842e0669651fdcd6e5108a433f08c8639bcfa9d
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.