Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7b28632e463fdc…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 08:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdf0cfb224dcb8dd6fb0ffe2c227a79e SHA-1: 9071130b1e32a7ce7664064f75be86e2198e57f4 SHA-256: 1f7b28632e463fdc0713ba31cc230849c2b4d8e925e1c27fb373bb0fd5fbcfa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm and a phishing trojan, with a high ML classifier score and ClamAV detection. The embedded URLs point to various domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the overall structure and detections indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/53981781645.pdf In PDF document text
    • http://csc010.com/userfiles/file/20210912092334_wtjz42.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/bedojexo.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/73461257143.pdfIn PDF document text
    • http://selidbe-beograd.info/files/11297491850.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/26797099516.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/buregilavarevoduzezamo.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109192116216347.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/tipibapipoludi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tq2rql2bmnhb56g41qsu4l6gr7/todinugogijufefelarime.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/80473155894.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1e4c5130c7450528224c6ecf55fe41fc/fojafib.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469b7fab5a3---19192616695.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/1367122963.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210903_86579275D380F802.pdfIn PDF document text
    • http://lex.tj/img/file/4646838785.pdfIn PDF document text
    • http://manu-transport.com/documents/file/pibigapefomupotujafib.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904205054304.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/3834533177.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xedawen.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kubujuxaxo.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/tebumisefifemamu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/nesazisaxofawazol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+sms+soundPDF 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_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 18332 bytes
SHA-256: 5e2e04943cf4580a23da02470940d7410ba6abf49a28ddc07d894c51f9a860c0
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10052 bytes
SHA-256: d6201bac583160c9cbaabee484222fd87029b81a4b8fcd704048fe6c06b7c910
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1