Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11b4c5502f07c2f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-25 15:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ff1328b8e71bf5accdb300dc4035760 SHA-1: ef479736f3ed776288f8d576bdfeb50e579d80a3 SHA-256: d11b4c5502f07c2fb6cda2cb480acb59725a5eb8e0ef370f672e1ba7417c26c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the 'link farm' heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://inwebjor.ru/uplcv?utm_term=how+to+open+javascript+on+android PDF link annotation
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/mezixofubanakasub.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/susujofup.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907202842.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/zeduvugutikudugu.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/59741228944.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/dasurukam.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/13464695534.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/89946138073.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f76c5e8---29253196194.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/22830291509.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dowobifexakoxagajuxok.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/40953662388.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210919233317.pdfIn PDF document text
    • http://mylodge-naoshima.com/41141282547.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423131191c5---pebipa.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/96802873983.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62748336328.pdfIn PDF document text
    • https://maisonforville.be/documents/file/82228694035.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/80986557354.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/73592377532.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913232609.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 10732 bytes
SHA-256: 24d349781312a4214379d952be156f6292634a701f40210df872bb4f9c10bb95
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 18296 bytes
SHA-256: b0264338c8be9ca96b31f54ae0c93c0147971e1ec71e232b61aa76d109ad24bf