Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bdb58be2bd919c…

MALICIOUS

PDF

97.3 KB Created: 2021-06-27 04:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bede6a3fb54c09cf5d3221dd524a1a45 SHA-1: 187fe56da268e0afe9bcf8ce761c7523f0c9c576 SHA-256: 97bdb58be2bd919c8b948ab0559485817ff7457609432f924e5373cb82ababdc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for delivering malware or stealing credentials. The document contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the lure and the presence of external links indicate potential for further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c3f66a1b---89137560817.pdf
    • https://manenshop.com/upload/files/sumagukizalos.pdf
    • https://zzhqhi.com/d/files/tojegalodawira.pdf
    • https://tomas-music.com/contents//files/gofetexukutitoxe.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f411d7a79---gufowudo.pdf
    • http://asbufestival.com/uploads/FCK_files/file/garagotofumikatewalopifa.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8fb1563e6943abbe92a5b41ce921d299/sutezijigadividasa.pdf
    • http://maility.pl_adresuserfiles/file/bijesufokirikomov.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac17d0799---mudatozusidewanagilozate.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4bufe1idvjqea5h66ktohk28j0/tatetirusuvejaragufegu.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d457f617c011e44f4671c69a7cd601c7/kekewadipuzonisosogesot.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2b9c5932693bbc1c5b7a5ae4db0d3d41/43461718142.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/85d2148b0b65464399492df2af65bdf4/4014213371.pdf
    • http://byty-pardubice.eu/UserFiles/File/jafuzevowewosidotoxuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5f5aba1b---niridalalokesapidonotujob.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/polakisezobirilol.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/721581066.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c91fe21ff---36036270846.pdf
    • https://euroroma-bg.org/files/file/7442380516.pdf
    • https://hotnews.md/upload/userfiles/files/35398870696.pdf
    • https://smithsgame.com/calisma2/files/uploads/87569877768.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/593a6628292a7b1d2c5b695c2da6ca56/13781854474.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=total+number+of+missions+in+gta+vice+city
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abd.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 1860 bytes
font_01_sfnt_off0001136f.bin
72eeb9d8ab38f23070d5bc442d96f0b29521daaf7445346257e11b5857e32da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 19788 bytes
font_02_sfnt_off00014595.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14595 16792 bytes
font_03_sfnt_off00015dac.bin
56bba3c5acd94a021a450edae65affd210703534173f9a933f6881a4bd3e0049
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAC 11064 bytes