Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba699456f956f208…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 14:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cc83fd7232711ff44dc2085ad3dbc98 SHA-1: f6a653ba9f415d2081c832393c2d0c359de930ed SHA-256: ba699456f956f2081f707040960349216d04370afa46087901b35c09e284bbf2
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hiroyoung.com/data/files/tapozutukuvazaxerabed.pdf
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c1ff9754c3a0e04bbaa56f5b92579b4b/87187657655.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zesokazuxajepovad.pdf
    • http://schokofontaenen.de/idata/66042486407.pdf
    • http://cancunday.com/travela/img/files/10955470401.pdf
    • http://tdvvietnam.vn/webroot/img/files/polijun.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a8c07303---1565566567.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2d13f1ce---bexajobewagute.pdf
    • http://steffis-strassladen.de/userfiles/file/mujur.pdf
    • http://vititanon.com/user_img/files/85755671161.pdf
    • https://radmangroup-ye.com/rgfiles/file/89397078237.pdf
    • http://9262895.ru/ckfinder/userfiles/files/baneju.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/zadijagiserotevod.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/90478097362.pdf
    • http://fatamorgana.fr/uploads/assets/file/sijokorofegijatitu.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135e811c284f---48531282983.pdf
    • http://meuseguro.top/fotosempresa/files/70265241884.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330efcb3d52---98918979584.pdf
    • http://vidol.nl/userfiles/file/32373659908.pdf
    • http://larben.cz/media/images/upload/file/nejefanojunijiwimu.pdf
    • http://www.jindatunnel.com/up_files/file/49930238272.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/jufiwazumotujizasamarepox.pdf
    • http://michellenevinracing.com/FCKeditor/file/96818117163.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/22923931244.pdf
    • https://sukaunited4d.vip/contents/files/nolil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reset+open+with+android
    • 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_off0000dd8b.bin
45fc6ee472133bc0c23c06e2c2bb4e38075263778f09e21bf503d6102a685f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 10520 bytes
font_01_sfnt_off0000f575.bin
ff979025e2fda914797d5909492c3ccff3ef93ccde0ea9f654d8a6be36e0ff46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 17808 bytes
font_02_sfnt_off00012358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 16792 bytes