Malicious PDF — malware analysis report

Static analysis result for SHA-256 d225502a79918cdc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95aebdd90fc27bcd837e6bdfe0e4a517 SHA-1: 977c5aee0f0610069eaf43632431a387dc6f34fb SHA-256: d225502a79918cdc679ad3987fa1d9f23a8fbe439bee830544169eb87e50fa08
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+do+you+add+an+image+to+a+pdf+document PDF link annotation
    • http://nfc.soo.jp/file/ranobuvufab.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pizoruwawaxu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/valasulilixujozaxabitu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2e6bofvferb7bap75acml9kko1/21987517739.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tisutoxov.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/41340236418.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/3778513423.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/vividexofu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/pusomeguferaputatevokofo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c88f2dd4---35096586772.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/k022itk98u8vk8mpa5v4td1heh/41595668305.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d8358824---vomulokaxoxorub.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621595232.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210608_6079D3CF53E54C2B.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/62598668979.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/vezagisogaj.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/73400386921.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bba8078bbe---bamirivito.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/42206244184.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/90883929893.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5b9460d8602f197e114072728544b226/lapurojorefixosirinud.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dukojimavek.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jobakadifojufax.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/disomibopakozigede.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16808 bytes
SHA-256: 6dc4812304249143f7b51fd4706370f3cfcb2ce5b63ef60e17e147a600c216fd
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 10940 bytes
SHA-256: 37ac2ec01a746b0794afee5e1b310593a3e48d536cebb41d9fd353363d6f9a62

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