Malicious PDF — malware analysis report

Static analysis result for SHA-256 10acaba120ed08cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 10:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46f7718fc0656d924f4de17a024c59e8 SHA-1: 6ecb2c2c44a80e84172639a737ca6689506c9de8 SHA-256: 10acaba120ed08cd02c475bbb7584a7ec0b0a41e689b038bda59cb2f7efd2e95
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=bud+not+buddy+study+guide+pdf PDF link annotation
    • http://imosa.asia/uploads/files/202109160506375873.pdfIn PDF document text
    • http://th-hl.com///upload/files/18035653603.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210916181024.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/25973266764.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/pexakedarolipanoju.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/lotafazuta.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/tinibix.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/42972503716.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1essho2dnqoi3j5oaqi7jscdmb/29236770698.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/48361338183.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/16247554255.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///782151784.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/buzijigebudanilut.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/nenelivabogijuxusixud.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/54668573045.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/bavazetazifafumivirebivif.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f67d48317a0d29713eb9ec62d3dcdb07/liketixajamikodapuronixub.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/57069128144.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/surapozotatini.pdfIn PDF document text
    • http://skia22.ru/pic/file/kujukevo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/nisozuliwivotifane.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/85556318240.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e688c588---76429120963.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/kupefodadewix.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 10772 bytes
SHA-256: 93fde23073ff3a11d4f7aa43811a6db041ec7c6e46d0c19e691689913c2ae706
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 17296 bytes
SHA-256: 560ca0e7093459f0205862074c189e8cc489df55cb7e9b3cd312a7913f6a6527
font_02_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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