Malicious PDF — malware analysis report

Static analysis result for SHA-256 b498b59b4da35e53…

MALICIOUS

PDF

97.1 KB Created: 2021-08-03 07:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1be1d2324b4d1d7609e5b1b5183fdaea SHA-1: cec9b7e2ff2cdb58e1c86971411d8b38d25d1d1c SHA-256: b498b59b4da35e53713222aceffed95a4973706c93358dfec37552d8515a1eb9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or facilitate further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://chieusangducphat.com/uploads/userfiles/file/vorafe.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e1918481d---zawuwobe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c51b8e9b4c2be4d3cfb60db37e5b374e/tonizekikigasitower.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca350d08da---36778449944.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a653f2d8df0---bagakazonax.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/bivik.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/rariluzeresimapuvax.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61899328776.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/73068783630.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/795ff8de8bbf5d07c53c0ebaf482b302/mubeponuwodop.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210612182536_25zood.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f125d2894649138c58497d6f68259304/9751815614.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bbcfcc43a7697d7d4c3adf547a1c835b/nogusetuve.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/lugebukufusugat.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/83821400855.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f03754c4389670dbed324e55782dab8f/wutexuzedurizegu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/musivobafatulobirovawi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3a700a2d83908db85681709839c081e8/tufoguledax.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/84241233411.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9erdbef4vsk4rlku3t8uqh8l8s/dimoguti.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vawavitenigudipifilowu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609952f58359f---nagerujuxozusipudejik.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210617011310189.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa1b8cf9f---soroto.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff64e04910---tevixosaxabilivexomufixe.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/17eba6d5d7929e33294236e731524045/rizizotipitemufelajev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lg+24+inch+led+tv+panel+price+in+indiaPDF 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_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 17040 bytes
SHA-256: 7fbb7fb9e70ac0602cc6c13be33c7eaa754c77c5960694fb35eea6076922b272
font_01_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 10728 bytes
SHA-256: c339ac57a4bc2af40659a324757bc40ff6a17a31ac487d796428b5bc1cadbf15
font_02_sfnt_off00015bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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