Malicious PDF — malware analysis report

Static analysis result for SHA-256 e187123c47126dc7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 15:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16cf0127be2ecc3884fc9b52a567f542 SHA-1: c806a676eb7dc8e729dd23f937ab7b0c8d01fc2c SHA-256: e187123c47126dc7aabbfebdfd09ba39ef5503849b1243066b8dfc9a7adf575d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b98053eaaf---86988561297.pdf In PDF document text
    • http://pioneerbuzz.net/userimages/melidotanavadorokexege.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/ruxujedojivejiwazolurasiz.pdfIn PDF document text
    • https://best-label.com/upload/files/xufepanetefesinabopaw.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/25714407403.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/javavokimowutisawixixe.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/fobofugobunesafeno.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/27103161413.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090700544365.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328264052d3---13813048062.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/29261459799.pdfIn PDF document text
    • https://agrando.cz/files/file/kusofaxigufeferukemezilo.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nowuno.pdfIn PDF document text
    • http://wsm.hk/images/files/pejufipimubesirapasuvamex.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/27125618213.pdfIn PDF document text
    • https://j26clean.com/upload/files/94367280502.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/puwav.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/58593434214.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613382d127c66---janupijonafozunavefi.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/48036655343.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/40042161568.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/tefalenepuvuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wrestling+revolution+3d+mod+apk+2k19PDF 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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 11496 bytes
SHA-256: 30e94712e854eaa45c22cd6af83926416647e84b464924dfad30c979a978f580
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 17180 bytes
SHA-256: bba4bf706fff6957e5888dc94473c57962b5e8fbcde986799a40576bb6203f06
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.