Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8eb44e77fda894…

MALICIOUS

PDF

92.6 KB Created: 2021-09-18 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 27b0f3636a25621c44fef5ac3868212a SHA-1: 89861b4c67252d64c06a858fea246447c15e662a SHA-256: 2a8eb44e77fda8940d77a1683e9b2dba116d2127cb853b63901dd6ff41161e27
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • 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.
  • 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://hide-bo.com/img/tmp/file/29557258369.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161422dc58c8ad---deposumomamameretokoji.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ganirewalozuri.pdfIn PDF document text
    • https://renewone.de/files/pefut.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090203014280554.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/81183201663.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910150038.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/94729827012.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/pufedakerawesokuvowifezu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/maxinovalenasezolazuradob.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/xatix.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163159632114464621683.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/abd27394b9634d2b73302d1cf4e8d3dc/kilakizelofemojam.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94331221328.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614541ab17ca0---xozeweremijifuguko.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/wobufenumigemafapujusutux.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/14721269507.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/didirikaturuvofoladenupef.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/jofoluwimalesovavijexosix.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wuxidi.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/8719790016.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/79990081862.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210912_011909.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/udfo608n67dt1qavjkrkqs5t26/95932521995.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142979885190---1348373617.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stock+screener+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10396 bytes
SHA-256: b3de8464781e575ed3457bea7b7812cebe71b5f5dc0a33b3bc3e67cd8b6c8c69
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 16324 bytes
SHA-256: e02f7a2c62afe0e867be0da5a6f2f525b9ab3943161d924a42da68a9fbd817a8
font_03_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 20412 bytes
SHA-256: 4052604c4591cd6614a9853447e11b3c05abad21c99ff9e19152b06fe738067a

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