Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5decd36418f97b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 906fb3c7f2df7b2fef8cb1f342757f87 SHA-1: 92758a86a8fdca33f765690e857048405e2b25f6 SHA-256: 1f5decd36418f97bc453f8df295569fef1d6a7f592dbf71c607662d95bb75e3c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and potentially a phishing lure. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to external sites. Multiple URLs point to compromised CMS uploads and disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=synonym+for+i+feel PDF link annotation
    • https://brakos.it/file/jifalegusimelulukabu.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/kumiper.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/58016242548.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/67978820240.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/bividusej.pdfIn PDF document text
    • https://kiptep.ru/file/garivikukokepikikewilowo.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/71155217202.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/febebokogivijegovomi.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/51160410403.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/59442437516.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/39300898434.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f781fe57d6---zewuzexapuvubugunazuma.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/59605116885.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c51c8d8ef---zifeluzamesixi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pozurevowafufesojadi.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/28795997514.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/77446420287.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xomanopinaxejil.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xezipujabijopinim.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794fbe3956---sususexukipapufes.pdfIn PDF document text
    • http://szhlfz.net/upload/xavagalalor.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/19301201665.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/kinivuxezikonab.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_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 18180 bytes
SHA-256: 77e3ca1bba6e2df1bbfbac34207b740e8058f0745ef2d48107aa43945b91bdcf
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 10136 bytes
SHA-256: ad10e7d2b45b0c8105682182a99fbd0472ee9dbd3a68662cf4f07b65fe6be99c

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