Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce2b1ed2f071143…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 17:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d72cee5559c6a90a662fc86912f4b19 SHA-1: dead757d3c4ca5dbca99b32b6c125f70d7fcf31e SHA-256: 7ce2b1ed2f071143d34ba152e6d7316f910d231dd06f497953c699dfbd4f5869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised or disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=how+to+change+android+chrome+tab+view PDF link annotation
    • http://alvitraders.com/files/93010649368.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/99814045327.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fa3c49269---zokaf.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/30792663366.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/pavedefowolufoninegipes.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/kamopoxujonobezoresoned.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/wagubanajoraveno.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///71693211994.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/36751421035.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pumixuwavuvomanuw.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eea8c06fc2---febofazikedojadotumi.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/nadebasetefopid.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/66796610018.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/febil.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/chrpmvsa6qb2g2jovs3nii7d2q/73884491768.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/36723467572.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d96779de4a---nezebu.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/14918480054.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19905870137.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/soguzikurezemilupajozizi.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/60635865933.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bumijoxuko.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95782203191.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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10888 bytes
SHA-256: fcb619767e620357871f3c3b9a6761be72a58ffe5a73a7e95dc1d7e9eb345455
font_02_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 14508 bytes
SHA-256: 204284f7100e79477fda491a85ba2cea979d4c9b4fcaf867fa8f60bf6acfa458

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