Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdfacfc653d1f5e…

MALICIOUS

PDF

96.8 KB Created: 2021-08-07 08:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 932719c54c765b227d5ecb3af43c816d SHA-1: 00f6bea31b4b3de18dabee24e1653d197b10ef70 SHA-256: 1fdfacfc653d1f5ec589f97737bb73af0200f27a5761f3c85a32c0774666f0af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The presence of embedded JavaScript, flagged by heuristics, indicates potential for malicious scripting to execute. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • 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://www.victoriousintl.com/new/resource/files/93661083144.pdf
    • http://shiinamotors.com/js/upload/files/rujidofu.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdc371b76---30976291921.pdf
    • http://geredekombiservisi.com/userfiles/file/41107853762.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/c625hllaud52phvltse7ib0tlu/46257428785.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9d50e877c1c23f8f5500464c379f205e/meromufuke.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/73ff2d347d3fa094b7eb16f22c617d15/87457837901.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/57b52692cce7a021134d7bb087f33abc/sowenesugogipoxunuw.pdf
    • http://minhvuongthuphap.com/upload/ck/files/26325134378.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eae9fn8noelj2d42i0f3jqdnj1/34637730924.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/kugomevexidogadezusosode.pdf
    • http://piotrkowska77.pl/zdjeciafile/patulewezurujoju.pdf
    • http://traktorpulling.de/ablage/userfiles/files/mafofafazenuveropovirux.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607614f22862f---43672860043.pdf
    • http://logo4you.dk/userfiles/file/99009402842.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087940a30cb7---jutovirolimorifojokasow.pdf
    • http://yhbinternational.com/userfiles/file/15064707478.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2dd03a1efc3df8db313aba4796d49e/63141983158.pdf
    • https://sayurmateng.com/contents//files/dugibiwujibajalovupugevo.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd349bc76---soxugup.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1a31ee31dd01f5c0b32e99b174fc2aee/pipaduzubolanagokelepika.pdf
    • http://helloslow.com/data/userfiles/files/12264637515.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a9100211e---20805860089.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/84581420292.pdf
    • http://mwflower.com/upimagesfile///xupelogibezikanipidoxoto.pdf
    • https://reparationmobile.net/userfiles/file/namog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=easy+rice+pudding+with+condensed+milk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb96.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16312 bytes
font_01_sfnt_off0001119d.bin
0e230599bf4122b85d1e4692c70c7be9b08d5dc66f47926a988e8c8403e25508
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 17960 bytes
font_02_sfnt_off0001401f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 16792 bytes
font_03_sfnt_off00015836.bin
475197617c88ae41d393450d0ad0ed755ef87e0aadce48c9a8ff61c0fc7f9b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x15836 11336 bytes