Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3ad12608dd0ca7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 12:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8d57b513b348533b905de43a8c8e14 SHA-1: 5056268f487fd712b18e9a624a2d86375b9d27f8 SHA-256: bb3ad12608dd0ca76439f910d9b862d9e165b4b28ecb0a13e0ee20d8d196a5e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF's structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://oniceh.ru/uplcv?utm_term=how+to+read+free+books+on+kindle PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jq1p01cbrd2584cptl704ri86k/jimosekarotum.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/binukaxusajajowomiwa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0adf2c8ebcd870128c5f271fd6d572c/20405659470.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gamejis.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/99124695409.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/fisaguduj.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/18520164607.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c524b1913---64118083160.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9df47a46c14db0e046ddea0b54d0c877/72400534696.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/lozajibaw.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/wazakalis.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/bujuzevatemewerif.pdfIn PDF document text
    • http://infosierra.es/images/editor/43267429746.pdfIn PDF document text
    • http://119pump.net/d/files/43310743217.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xijodizabagafusoz.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xofiw.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/52388978839.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/48339963356.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fevizex.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/68572725152.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/54881240587.pdfIn PDF document text
    • https://geniodelweb.com/file/58333108590.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10570231719.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141639b62f77---ritokuvaxivojofapuwaxol.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wuruladutotisizusukivosuz.pdfIn PDF document text
    • 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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 14888 bytes
SHA-256: c41178fc2f42dbffb075f46923eccc302af214066ccdcc82b6586e0f8c6ee1ba
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10656 bytes
SHA-256: 2a7af3c89804a49d4b12d0d84666e853ff0e540cf9f9bf0bb8df5288227a8c88
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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