Malicious PDF — malware analysis report

Static analysis result for SHA-256 d523944451057383…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 21:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9baa29e6f049a2471dccc7f848174260 SHA-1: cdbc20a479bb39117d4a667a098464fbc7cc8ca1 SHA-256: d5239444510573834b31cb1d007357c0f4653d3bd6ed05b06fd4d913504d5f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=different+types+of+dosa+in+tamil
    • http://jl-vacuum.com/upload/files/75001552491.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16151ced076984---18415561698.pdf
    • http://pyramidplaster.com/file_media/file_image/file/sodejatatela.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210920_A821F21F61779645.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fab37ef5d9---mudavo.pdf
    • http://eubeer.vn/uploads/files/migewepubobolivexulegamin.pdf
    • http://vdavloeren.be/userfiles/files/fileguwuxojumoved.pdf
    • http://fullerton.kopanramen.com/uploads/files/80502528699.pdf
    • http://abwvictory.com/uploads/files/bubupi.pdf
    • https://otoform.com/upload/ckfinder/files/5337197056.pdf
    • http://parcroyale.hk/userfiles/30369508434.pdf
    • http://seibyou-koujien.com/files/files/fukenudotasozuraketoji.pdf
    • https://brukspec.pl/upload/file/73542451181.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/fubidemekinokefanexede.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a12d64d23---kegigesikupubiwigaji.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/36130246917.pdf
    • http://yasaitogo.com/uploads/files/gebisosisi.pdf
    • http://nebovsem.ru/app/webroot/files/files/86748465429.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/21810171212.pdf
    • http://toanthinh.vn/webroot/img/files/78721469270.pdf
    • http://akiisushi.com/uploads/files/2157637839.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/40469345072.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c1701de3---40860373442.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/84019675113.pdf
    • http://paulabenveniste.com/UserFiles/file/6652197530.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b355.bin
f8e8531797c6abc81027a7e19da860d1ff8a3ec69be0ac7f192c9c95870c6686
pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 10772 bytes
font_01_sfnt_off0000cc24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16792 bytes
font_02_sfnt_off0000e436.bin
efa417487ec7df5c5d8837cfd40df0afb303ea174d6e06eccd509e2fd3df02c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 19896 bytes