Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd01b7cf4c3dec14…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 08:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31590faee89607ea47897f772b6b8def SHA-1: d02224a431bd17430b18f69623cba193d33a4cc0 SHA-256: fd01b7cf4c3dec141751d0b61dfdb430f3890b9e85292c9e469bb4c0c0a848bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, many pointing to compromised WordPress upload directories or disposable hosting, indicates a link farm designed to redirect users. This suggests the PDF is likely a lure for phishing or to download a second-stage payload.

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://gz-theoutfit.com/UploadFiles/FCKeditor/20210630083648.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ea44fb4f---xiwobotawufixuxipav.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/9036583001.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sekugixobizimimi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebdc603f4e---mukowisenimuzizakunida.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/21559564944.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/mowagisogadogezo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gipipubemen.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021080401313373499.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/36953144785.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52838b5fed---41373378572.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/mebokimipajokabofuw.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/87704066683.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/77960322441.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/63bc5cfe20938797efb40fc0b4abc14b/zuxominuruxonadanab.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210818224556.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sopapesuzedevezekijaruzek.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/rufizexuvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92c305291---lutigadigofopurala.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/68244840155.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12830244662.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f42e82971---norotabubukuvorupalub.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109669d79846---17404234216.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/93cedc9014a6a553a2c9ca57b532d4a7/66739604949.pdfIn PDF document text
    • https://drive.google.coIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fpdf+download+headerPDF link annotation
    • https://drive.google.com/drive/u/0/folders/1NSytJFuo4ahcMTPcc6MwxjyuM51l3e_5In 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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 10300 bytes
SHA-256: 05bb5dfdec5c7de78133ae8c23b8531cce84f1f988c7898cb0dad3916b938d05
font_01_sfnt_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 15008 bytes
SHA-256: 4d93d01d94d06dd8fe0e37e359b023861be477a81fa2a89e32c56d19a9a166b1
font_02_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1