Malicious PDF — malware analysis report

Static analysis result for SHA-256 00055e285b0b7a0a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 09:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab3d804004142b3b941db77d5ef50301 SHA-1: c70ddfe47959372ae85ffd0f1298a76e969327cf SHA-256: 00055e285b0b7a0afcd154bd6a7453c019ea9c25743bf8403a9c1231151f6fb5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including links to algorithmically generated URLs and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fotografoenricogiampieri.it/userfiles/files/bemibuwosagavesetud.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q04ofng2hvgs0nt8grdoh62lr6/sipezipaxiliroja.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/41012819868.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/97088390461.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tagakugiwipu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/osrkef12g0lklh79vdpbq1p0mr/nivujanaxaliniluzilejubaz.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/poxapozibepupanuvegedoku.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/setududumegozotov.pdfIn PDF document text
    • http://186086.com/upload/files/lafedelud.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vumejezuxuxexufez.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe68d72e7---gexoluxapedopuba.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/64902307572.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa34f0174---kaguw.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fuwodurozetu.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/rumitun.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/12271038858.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/97758585950.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/64594467747.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/xigikuminagopu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109111946267255.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vematuxet.pdfIn PDF document text
    • http://irths.com/upload_files/files/tagatupaxupuzoduw.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419389233c2---rigijidejowaweguboxujom.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/divabajunubaxesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=browser+paling+hemat+data+untuk+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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 17780 bytes
SHA-256: 34fb4fec03bc233bd592910844a18ddb8e903c2a702e275589bf0711ea867f7e
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 11172 bytes
SHA-256: 78bef4adeeeaf2223790bacc77ced0d3dc8d2ab141cfc346f65bf097b541d5d0

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