Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa816e8a5d637b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 23:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f02e210740a36e322af6fee2e96d75a SHA-1: 046d9a35dd28dc627a0b52061c287e92df421445 SHA-256: 8aaa816e8a5d637b0e91a12aa03ca8e3edec620dc2452a6166a52a9ee7be5d7e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=watch+my+hero+academia+season+1+online+free PDF link annotation
    • http://alfavit.tv/userfiles/file/nizapokujoleguwok.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fijovusivito.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/nefolekupejudu.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/duzaduxejulonuseg.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4c1734e5---zegiletewabonevebafigime.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/8171484573.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/zazakisewigoladesejiriga.pdfIn PDF document text
    • http://4yoga.by/pics/files/38252284903.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/75546236197.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/filobupexiliponuzeku.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/lovemopupijabizevugilolu.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/63510073527.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nuxipimiwovagutetasumipe.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/mejafekaki.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/85391268595.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/butodakok.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/51151740230.pdfIn PDF document text
    • https://tebra.si/userfiles/file/23361872636.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462be62415---60988438597.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f51c7e3a---pabixowitavuvevesibiju.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cefca6820---16840571009.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/nupuponijo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908043755340519.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jisibumadawonodabakij.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/bumekipujanufabofovinifa.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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 18032 bytes
SHA-256: 70bc18d147d9cf3f7897294954489332d4fe617101d4d9c40f08b9150c23f624
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 10900 bytes
SHA-256: 0fec8fc9d59b4f12ea9f0bb6cdcd61c9d61403a7a4a92aca04e034531bd6c68e

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