Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bf1b0fa8aaaa7a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 02:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a718211c195a3d95eecd0886dbc486e9 SHA-1: a91ba644603844092029ecc1f56025f4c2549588 SHA-256: e2bf1b0fa8aaaa7a8e1b087e0ad19ff8955267bbe91b7495b26097c016df3832
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=is+spinach+the+same+as+silverbeet PDF link annotation
    • https://sofupingame.com/calisma2/files/uploads/nowep.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3ec44316375a243c6223ba564cff2c6c/63420465067.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mivun.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wubavuvinebo.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/46269831454.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/64817874395.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/loxukejojogurasegasopo.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/mejinezonobusoguze.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/37265024973.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1643206200613b85bc3e39d.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jubomuvotezemapivem.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/rosuwimuzagosawegu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132920c3788f---49097640826.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/61278951776.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f610281910---48077831111.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/pijojilowonujelusobeze.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/bajoporoligalopekazufesix.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/muwuvanojudugupi.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/5328865809.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/52893655319.pdfIn PDF document text
    • http://hkacca.com/userfiles/judoginixotu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/banavilovegigokugatuker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 10676 bytes
SHA-256: 72c84c9559f956482c2f4bf363cdbe6d396a38ea8ce0bde2b337e86a041070e2
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16712 bytes
SHA-256: d4836a1881b25115223884314b535510f234fd459af75b9bdb2ce68223a59ae1