Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a76fa16f7783109…

MALICIOUS

PDF

96.7 KB Created: 2021-07-16 02:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c679b1c11277411a52866dfc4228e5f SHA-1: 0c7f62dd785be18143e7204d7c60c2ece91e0c82 SHA-256: 5a76fa16f77831098bf65bcc5ea132e977d2ed39c795e861d44f7a400fbd18d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://liubeauty.com/luutru/files/19472317059.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i6g5m9bd83h7ceh7usv3aergv5/jikisazutigura.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tuq1kgposfd8ka8rqb8k60fahh/bujugezoxujivaka.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52b0dc7c9---boxow.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fivixogo.pdfIn PDF document text
    • http://nakatka.com/files/file/65221929915.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b0d5dba7---79437749042.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/vuxatux.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/tisomalezarefibijevuv.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/gasefilanare.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e998d0ec---98538078673.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/be52561916a70dc47c87873585bb01f8/geluzevitelor.pdfIn PDF document text
    • https://amblamy.ee/upload/file/vowabidudoxazasegakonoxod.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210705155816958.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080468b13695---vibefirejojuwurijaga.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb654c2f0---63948578420.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e1421d9c---47558511716.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wuruvaributadifevufenumam.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb2f3a7ff---jafokixikikir.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/4890663024.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wedemifasoren.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0d34b2b22e9762ce5b0c523a350e5408/tudanejiboxadipogu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/kuripuvo.pdfIn PDF document text
    • http://ciskmv.com/css/file/piwor.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/72752394348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=thermodynamics+and+thermochemistryPDF 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_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10668 bytes
SHA-256: cb2912e0f0b2f7c6065a9488a487188356f66f9bdf8f3221e5cb73dc8b12905e
font_02_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 17516 bytes
SHA-256: 4065e21b6a7489bef45281ece1ddf3198fb63b2e99e84fe2d4fd14fa062381c6

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