Malicious PDF — malware analysis report

Static analysis result for SHA-256 5608b81ab5d3b132…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 00:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f87e1e4706bb211a4ba49cc92e2f608 SHA-1: ceb39502aac6d35ef8ab73ad15ddebaa6abc4364 SHA-256: 5608b81ab5d3b132ac1d5755c6b4ac20fff3937cf06399cdb820f9523606f872
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of multiple links on disposable or compromised hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21c196a46---fawesukiligadagokipuzige.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026c8f2be24---nutonadudoz.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750a007781---36028469960.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/meninafumatix.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825f313b02c---94235769702.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/23becac710ad18ab2dc949857ad702c4/jabavomosaxep.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/38182363220.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/17938965713.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16214578287854.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12dea45df28cf897145feceab6d896df/87014158421.pdfIn PDF document text
    • http://gibisch.biz/files/files/39986421146.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/kesugojemojiduwanudijunot.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/20440006192.pdfIn PDF document text
    • http://fedime.org/imagenes/rufapi.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19660202422.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/genebumama.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec01d830cd---zilowi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fefiwalagowik.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c165e543cd---kisorupagarimurezonuk.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e1e39b02---31713131855.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/39771025287.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/misamusebiriji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+merge+more+than+one+pdf+filePDF 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_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 10856 bytes
SHA-256: a33e34216d152ad89f59a04455f4d9c3d29bab372f082f374edf0a2d5e495fb9
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 18252 bytes
SHA-256: a7d8d03eb96bb927655b53bed4a70c0b856a400088f7b3f58c7d4fad1dda56fa
font_02_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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