Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3fa3e7acb16773…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 13:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ff5fd3f291faf09dab21486a400981d0 SHA-1: 0927b4d35797deb9c81a10142a7df6d9e0168835 SHA-256: 3e3fa3e7acb1677304704c3ed3cabaaec07c64b9c761595c4bdcadc095caa7b6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and multiple links pointing to compromised websites, suggesting it's part of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://cructi.ru/uplcv?utm_term=ser+bachiller+2018+sierra+pdf PDF link annotation
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/51982822786.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec13a529d---memuwiropesisegavoliludim.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ca9a785e---ziwapixizekomusi.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/guxizijoxuferejuz.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/6332341839.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/49079493774.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/nusetagejekuturofu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/32072186716.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/52490484238.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dimutaridalelazavav.pdfIn PDF document text
    • http://sun-eko.eu/files/file/texofilutuvab.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/mivopovegafavedakipixoja.pdfIn PDF document text
    • https://kultmotor.hu/images/files/2101616193.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f78b54606d2d81643c2aedc1b04352da/58245098354.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022ca32321---32112570807.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/modigupanatobizetovenofev.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63024c173ff424655f2c25f4ebc63d7a/rosokexubomexe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071d06592470---27500223786.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xenegonowatotavor.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14e9cbc58---tekabasumavafiwubilakovu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/46283470886.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/kiwugoxelojupud.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/72877027063.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/11282178770.pdfIn PDF document text
    • 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 19112 bytes
SHA-256: bf498b5877c221cc9d25fe1f68348c95d32f1c0d469c159a76e7848172e0893e
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 11112 bytes
SHA-256: 74d1f65dd5f0142a166a28af16020f5eceba1a8a8894662d9de3e3fac4ddd04f