Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0ab5d24d59581c…

MALICIOUS

PDF

78.5 KB Created: 2021-10-06 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a56b08d334c59dfedacdea17461df310 SHA-1: 66c4692e9d4a94c204f839edff436997b0a7dfee SHA-256: dd0ab5d24d59581c79108b197743f63e98e3073775f21db6408301d8078508c0
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dalnoboy.com/data/filestorage/upload/files/silenab.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/tofaxelefozovozetuv.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/merodotituwowopis.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/wetenuzilubipipoxirok.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/wejimot.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/rifogapanitizawezapibop.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/nafudutopezokiga.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/70001020907.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdc9ab4538---jeniwukonemijazevureni.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c966dbf98e---28136813040.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/vasobawujex.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c977c4cc24---lapujuziwebexi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/72064655854.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/tudivin.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/98708218628.pdfIn PDF document text
    • http://speckrepej.com/upload/file/26536819132.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/75670249700.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20211005024458630.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/gesewoxuxuxotejowazi.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/xuteju.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/26786320493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=adha+pind+song+mp3+downloadPDF 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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 10748 bytes
SHA-256: de654798da8282136aec3cc8c2c814f32528dbb2c25763186388122c913ecccc
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 20812 bytes
SHA-256: d56a3f04ddd0b7c86031691aa0d14c97e1dd5b481c56450b4dab3a3f5d9473f0