Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f7b0e987ba18cc…

MALICIOUS

PDF

73.6 KB Created: 2021-06-27 02:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af6f76d80bdb61b9b1770ab8c4f13b4 SHA-1: 4076445a5094ed4c80d3ade002358630ec1ab74a SHA-256: 19f7b0e987ba18cc4f4f9c63e2bf23e714f158f4eacae2afe4f01dcc13a1fec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=easter+sunday+2010
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/51f56f4e93a86c052037c6c19759e25b/xevurolamalejixisigiv.pdf
    • https://fokusmedia.com/images/uploads/rebazirovolopuvofatumit.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/32595610023.pdf
    • https://tonwen.org/userfiles/file/73985015316.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s34g35sug2h69mk7009ohe1kv2/tilegitubilefuleb.pdf
    • https://weyergans-hcc.lv/userfiles/file/fifega.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4eb2f9d4---30953672956.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608152127cf96---11911079457.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n3is7875viqappg9a2rm0s4oss/xuvotinu.pdf
    • http://location-appartement-venise.com/italie_documents/files/baminadiparafanijezaza.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2f18df82---51540240071.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42d665f3de---37150628284.pdf
    • http://nordicaluminium.ru/userfiles/file/76214064773.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ab0cdb51---74929772466.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9fde4c75---25928506385.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a636a1e446b---nilorusowelagusijutedow.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b646b7c1e9---purapomonosororek.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dfd6c348---13975779250.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2e0e2935---65633270885.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7d9098f7d9---mikusupipug.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/21399321510.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac451c50dd---sovenufizigidogoloz.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c041.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 16792 bytes
font_01_sfnt_off0000d853.bin
5651bfa9abc380d27113a32ef0439b152103f3621b93869cfbdf7d1f325cec1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16004 bytes
font_02_sfnt_off000101ab.bin
335c7efaf0f162fdc6068b84a3722acb9db43273ce462e2b712069b6ea1c0095
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10472 bytes