Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcec1c0b8593a5c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 19:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b293f03c139016e2c3c622ab86661d SHA-1: f5bd3a5d7828361cac4891fc9e9f03a37e347c4d SHA-256: 9dcec1c0b8593a5c7358b9c18de0c06d621d22d93a10f4a5e3e5f743481f121a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b55829a0e383901e47d6820a754cda1/piberired.pdf In PDF document text
    • http://karimeh.com/public/userfiles/file/ginozogukekukimubi.pdfIn PDF document text
    • http://citranco.com/users/files/lolipoposemusawupa.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/21202325775.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/rilitugalorezexupozewoti.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/6059443618.pdfIn PDF document text
    • http://ccadl.com/files/20210903103320.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pusofixerotoxowigoniwedid.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/43305559936.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/zemiwadetobinoti.pdfIn PDF document text
    • http://finchamauto.com/pics/15360537069.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/nilanaga.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/xenuvofaxironosel.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vefuxomodeji.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910101654667.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/27031765324.pdfIn PDF document text
    • http://happy-land.hu/editor_up/vamusetupebulopazidek.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/ziwigapoga.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/filudoziwakoferufawowo.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/nowivomel.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2210002e---48519548494.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8270c5a0---32462216401.pdfIn PDF document text
    • http://oilspecchem.com/files/94601059423.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/jiwaguxupod.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///pokuto.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/46900195997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fifa+2007+para+androidPDF 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_off0000b575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB575 15120 bytes
SHA-256: f53e58d87938df59279a2b4bd92af5ea7947009f4f34aaa31a8272f2aeda3f3e
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10316 bytes
SHA-256: 3e923055d3ebeda2e534e0ca5748fe3b8945df973fcbe43acc0e08b171c0af14
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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