Malicious PDF — malware analysis report

Static analysis result for SHA-256 0382ec0f9588ee62…

MALICIOUS

PDF

188.4 KB Created: 2021-07-01 15:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74b74ec5ff9c2a5df3fe2527a37ac429 SHA-1: 4b82cc9f5bef63f699a472700c2c83a3a741611f SHA-256: 0382ec0f9588ee625ab3cc5408801b2554db5bb7c0cad7dd5aa878d7bc9cdbd1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://talk200.com/admin/admin/uploadfiles/file/79538696943.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210618023200.pdf
    • http://innotec-industrie.be/userfiles/file/tiluzo.pdf
    • http://allaboutdowney.com/userimages/fujinulutotuxosusize.pdf
    • https://kopari.hu/files/file/zabivulodaxizi.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7e3812f93edb83cd0c93b14741a4effa/47657191240.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e5e940ab---wilunogaxojavaselikopi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/kunuvi.pdf
    • https://geneticapanama.com/userfiles/file/21557401143.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/sopul.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ce148802---78087364600.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/2232640015.pdf
    • https://fonixkoncert.hu/upload/file/71027268889.pdf
    • https://hissekurban.com/resimler/files/kukiporisivemepumegofave.pdf
    • http://leakefamilyreunion.com/clients/63964/File/mezodonakepowukidapova.pdf
    • http://rosniyom.com/userfiles/files/59049435255.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5c406d2f64a11d1b59a84ef93fa40c7a/pamefotuvumomuto.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qtog486nf10budpdvch5ukcv95/towadenimuxujedokumasaxog.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bki31dvd9cuh675bmosoresvsp/gojutezawoz.pdf
    • https://allegypttours.net/userfiles/files/zokosuzida.pdf
    • http://www.anclupnapoli.it/userfiles/file/4973266897.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/rexewozujinajotefogaj.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae372cb0d8---12517724022.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fa533d617---bixusigunek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=such+as+in
    • 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_off000285c7.bin
2fcc4bdcaa004759cc207a3f13a9f1028f2eb32f5bd87789e444f8a64bffdc95
pdf-font-stream PDF embedded font (sfnt) at offset 0x285C7 18264 bytes
font_01_sfnt_off0002b4c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B4C6 16792 bytes
font_02_sfnt_off0002ccdd.bin
fb9f73c309ce9f2521e72b73e57f27990e06bf6022cae740bf4360e55b8729b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCDD 10008 bytes