Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d38b860466f44f…

MALICIOUS

PDF

94.4 KB Created: 2021-07-07 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fc131c68c4967ae4b84b3aa3fc49e006 SHA-1: 2530c0ff9633ab56a914308d371d9feadd5f95f3 SHA-256: 34d38b860466f44f8d6904edf551f13a2b7377be6160e68b566f9649cf27ef44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/zudidud.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63393266673.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/nowodizalasiwubulil.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/refegexen.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e4d0274d---83928198065.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ee081003---11546882660.pdfIn PDF document text
    • http://berbun.com/user_img/file/motukefuwojomomowosi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a01354ec93f00f58fd1fd837b2ca7819/54396107513.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/57049089873.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/butoremofiwenikus.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/j4pa7p6est23deaoaq9392q6p5/miwifi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2adbdf83---zabebiwadurawitozafo.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/29007556249.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a07dfb99a5310d618795ca54441231a/wozadoximadijomag.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210516211826_133791638.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/89915452953.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51581883914.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/50059581012.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/1650706252.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/81724206682.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/demumizabujixivep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+fall+pregnant+from+pre+cumPDF 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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17520 bytes
SHA-256: 55e8115e5d75b47a2bc7870e32492b089aa83cec3bef081776d9613b86ee2e56
font_01_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16396 bytes
SHA-256: 0d5ffd35431de3a46edebb3e7d04db42186100d4a60b404ad8ca180934dad6cb
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 10808 bytes
SHA-256: 75b2619a8d0a42cb5f642c22b7efab74f24d41a39cb58db798693c78adf20539
font_03_sfnt_off00015400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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