Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6bfc629f6b3b29…

MALICIOUS

PDF

82.5 KB Created: 2021-10-10 23:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e573d231cb2fc0a25f68b097be1248e2 SHA-1: ecc2338c11435262af3834b02692c5e5690c76bd SHA-256: fe6bfc629f6b3b292cbd349255d469da10537a85f40dac2bee6f3b92f616224f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to phishing or malware hosting sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://srilangkapools.com/contents/files/34588950727.pdf In PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fijadadagezalasutemunoj.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54327551230.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202110030837264096.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/gojinowuvogada.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405ad042cc8---wutefogek.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/45150686333.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/melagolojumad.pdfIn PDF document text
    • http://labotinnghia.com/img/files/23719210555.pdfIn PDF document text
    • http://www.andreapondika.cz/file/pifeludu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613619bd5a4be---88837875069.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tujetemomifumi.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/ruwefizajufene.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/83658493842.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/siregisupojolusit.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lefakemug.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sajevit.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930313f7e0---94733243488.pdfIn PDF document text
    • http://domuran.pl/files/file/gofitedelep.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/45055143042.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/nutubevofexasujizu.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/pejetoranujifa.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/79327737260.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/74894462690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=statement+of+profit+%26+loss+and+other+comprehensive+incomePDF link annotation
    • 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 18924 bytes
SHA-256: ac469bd6ff6ef4689b46896e63e4ef3460c0643d493514a7017d9c92436b1bb7
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10380 bytes
SHA-256: 8b0a2be3ce87fe7cc5cab4aec2583b384cce1bfc58378db3db583d27a4f9fbd3
font_02_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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