Malicious PDF — malware analysis report

Static analysis result for SHA-256 b499410e2b489ad4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 04:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a4acc95560f3861f00f0cbb0c83a544 SHA-1: f1f85d0fb4452a58eb56f6a6d6cd16a2ddba31dc SHA-256: b499410e2b489ad499027eb0e08b6b18bf8dab8545a060d889acfc2e9307ddf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medeeatour.ro/mm/file/wusejoz.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/daxafupisumixuxe.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/wisiwerekaponogoxapa.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikepoberatupi.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kejesopefibinabatune.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161378e6063f76---77545831219.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/37097044501.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jafiro.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/80960717257.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210909_E72057B44E1972E3.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/27419144644.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/benudozasiviwuxakozedite.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/votuwibagigunad.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93515995249.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/88252064197.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144b313e1398---69455288294.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/98585503434.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff59807d1---ledukasojina.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pezopuvojamugikuv.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25153992773.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/72161203543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=where+is+my+camera+icon+on+my+androidPDF 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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 15756 bytes
SHA-256: 9bd11d3f0bbcef61105b15baea2eee108cdeb28bad6274bf9bff510a3a1956b2
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10596 bytes
SHA-256: 888145f06a680155c0a2a10019602046e806b76e4d53d1210275467c0748a32d
font_02_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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