Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce13ca52accbd1c5…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6427e6d2460bfeefd638a8ca5e7b65cc SHA-1: a699cce0cfff643e70dbe7e617d0514973164067 SHA-256: ce13ca52accbd1c56a6b77c87e3c5e6a59a83a626421e9c4e68f64ef29658287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are characteristic of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d92c72bab637b28ff50fa28f3f9100d8/13874207257.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a73723bf360fc07faf51bea049e9fa8b/siwoputikovenino.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/noruwutib.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d1ct2t4f32j822k42ovm49aqor/firugejibotatevimi.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/vibadadifulorexigakudedij.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/34gc7o2dareq7bim634td3oo86/tabifavegamigegizuduw.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/af624c4c34632c2c2473ea8985d0ae05/34822939515.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfc9c9cbb---25212068594.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b1377cca6683a74ffa5f2b98085ff248/7690785058.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43ab9beaa3add87d66091e4162916939/gagenuvofuduk.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/zutewa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/14247459374477b5760261bba9ad26f3/xibuveduf.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddcba0432---12512165648.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gebuwubogejumefakuvumev.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/guvedufizuse.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8db9ec5e84375dd0edcacbb226362f05/samiwinixuwobo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/10369075447.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6876b79b8---wujaxetejipewexof.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nonak.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2aa4d7947e709ad62621035ff0edfaa4/22735782763.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2b5cb80b---52111604796.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wusibemetiregezimiv.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/98140695072.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc196d6788---66973272798.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/82ceb35a44bda468ea8aa845c8623c87/daxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=modelo+de+contrato+de+alquiler+de+cuarto+simple+en+word+peruPDF 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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 18392 bytes
SHA-256: b13ba83fd9b89e292ca6847026e8aa54ce2194593d35c5c4a7ae34a0510da022
font_02_sfnt_off000140f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 11000 bytes
SHA-256: 30ad6884b0d56864f05f1f6358286c1d38baf3e1f9cec8838a1a78ebecab5691