Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b50a7e542e06ed5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 02:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94833b439f34282715b1f2149d55cb7e SHA-1: 64809be2a3c67a83006f02622567e000266c5991 SHA-256: 1b50a7e542e06ed5a734342780d2620379645cd0727a74f80cf336f3a44b8039
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. An embedded JavaScript stream was also detected, likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://inphilong.com/upload/files/55795409827.pdf In PDF document text
    • http://myflora888.com/ck_files/files/98947758903.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/dekifosep.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320d9092271---94980399968.pdfIn PDF document text
    • https://porfic.com/fotos/file/nurekudepuxujirav.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/20717024592.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pobiwukelined.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c547f62b48---pozetipezipives.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/lozofagafasib.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ufj1ilb9i1bl8f44i27udus804/modiwujozopik.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/nanabovajumu.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109061257492607.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091115473973499.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/pasuxubupowuri.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/womaravudadewatogemi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/91452307718.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133123835ad2---pewosijowagusobupigafage.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/87574111392.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/vunomevabujosusef.pdfIn PDF document text
    • https://spacio.hk/attachment/file/nigoxokexoxosunupesapuji.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/86838017415.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905034355.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/xalox.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/30664208457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dual+audio+movies+480pPDF 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 10824 bytes
SHA-256: 89d75d09279d8f3d0b782709132ebe79edf8543949443bd50ebc2acecc0d019a
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 18132 bytes
SHA-256: 728be8e2e79d6b05eda5613396e87866457f1c760dff8aa94689abe7eea94892
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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