Malicious PDF — malware analysis report

Static analysis result for SHA-256 7043485f103c6298…

MALICIOUS

PDF

86.3 KB Created: 2021-08-19 15:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c32db6e210d7ccb30c8e2e3ab7a2b6 SHA-1: 824ea4f67bf8bcf01d5558de4d9e4e6757b50c56 SHA-256: 7043485f103c62984c472b66e4a49c7b0cf7a2a4094c16f2387c93df1d57c161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it functions as a link farm to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ktmcollege.org/public_html/userfiles/file/97247326072.pdf
    • https://aprenda-atdi.com/uploads/files/ritawuledux.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babb94b06de---44441294036.pdf
    • http://gibisch.org/files/files/47208781292.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/iuqhlu29hqtscbse6hatebm224/25259601353.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b06702491---6071890660.pdf
    • http://vhz.cz/user-files/kegavufajeserufeka.pdf
    • https://classconnbio.com/img-jacson/files/63555479507.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/90557429798.pdf
    • https://actor-conseil.com/files/file/jagenove.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f0b54c0703794e3f855204e63b1067fc/41443145501.pdf
    • https://hotelmitrutarija.com/uploaded/files/tojugarubutakatumi.pdf
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/ditimukinusifakuve.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfff37ff1---begajasebi.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4c1708537---solerutozowogomab.pdf
    • http://doremimarlikinsaat.com/userfiles/file/simufatidudusimite.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/233b291ad70358441de71d351bf78dc0/vemavijudukijeruvilotawi.pdf
    • http://hydrem.ru/images/file/81835237579.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c971b39d30d00d0496bcc237564aa65d/89830464416.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/97022274fa6cfeaa11059ec9512a7c6b/zujulofonuwidediki.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/04ee8d4c4f9ddfb5e7fca664ad4120c4/80823431550.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c8ace34b---julutuzafupafixagorerox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=10+ejemplos+de+palabras+agudas+graves+esdr%C3%BAjulas+y+sobresdr%C3%BAjulas
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://www.youtube.com/watch?v=Dd4raPNFxhA
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53c.bin
e7ee6d9f1e069d21c9563f05f37c79fbf8999585bdd2d3eb5ae2cdbe04b9b888
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 11184 bytes
font_01_sfnt_off0000fec8.bin
8ce9a3c27023556296a007cbf65a38b2c3492c11c654e1824926b3628dcfa17b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 19552 bytes
font_02_sfnt_off00012f51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 16792 bytes