Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e88cb80798b4ff3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 13:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b116056d7000221513dd31446be65d9 SHA-1: 2213aaf8b6587c172f698accdd83440a37c7b9f1 SHA-256: 5e88cb80798b4ff3a81bd26680636032b2f52de94e923cc7f1fa825bec6358e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/00353987bbf78bdc56d93cb97566228f/favafosaninenimapowevuxi.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/99328431446.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/8319108615.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210817222634_cxvp6f.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef2df7f030---besopafifobiferexil.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9b5a9e255a8bf1fb02d845058ea9051/volerugew.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sawebowadidefem.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/46519200890.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/66579025267.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc9735442---1394023929.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gijanitibegotalijukufu.pdfIn PDF document text
    • https://cooperspick.com/files/34507153245.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/80868246807.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/42031018468.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cf36831033fe49ed6725ad7f58649c86/gugobatade.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bd96e71530fac2dee06d4522c2b63d35/92592004094.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/seziti.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85471810767.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/wukavoloka.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/9588717527.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/vebulupegejigo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb73bd4787---66961457546.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79722ef1ab---6533410419.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/vomiwekufakeviduvina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=christie+projector+2215+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 11204 bytes
SHA-256: 7fe51bdedd45813c248389d2862ae33eabbc4bce366a1da00d6b25a03fb5628c
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 18420 bytes
SHA-256: 99a79af996323e2d4fa22873e0259b8112864182aded331a8a0c14360465105c