Malicious PDF — malware analysis report

Static analysis result for SHA-256 73504256919df940…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 05:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4481dfdf8036fe6ae5164404064cc452 SHA-1: 0664d759edf00da2fa7cb4e5fc6ae7aa49b3aa8b SHA-256: 73504256919df9400423579b258be82538c54a08a648cd22c64b3229c8d13187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the URLs and the detection name imply potential for further malicious activity.

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+copy+long+text+on+android PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8ded4e4598d35b15e0fbe223e37cce36/wofumepixajifewaparir.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/26167048677.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/54166725426.pdfIn PDF document text
    • http://bisnismedsos.com/userfiles/file/48408195325.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/jorowuzime.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/50259746728.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pasazakubegebepakitakufak.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4af3c7c6a---37015615750.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xatumogikivuposi.pdfIn PDF document text
    • https://tuinvandecruys.be/file/97199319060.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2e074a9e8---xubebotatob.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/vovatajerowomewejix.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/betomofadoda.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/tetorekikotiwolobaf.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/rabil.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/19312749575.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bugaziwoxizakiro.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/guzotejotitovilo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9d0587fd---99583035869.pdfIn PDF document text
    • http://alltechsro.cz/files/55458569969.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/33515655833.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/96168035744.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/46209923295.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nanadeduriwow.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/duwezoparazaverejinilu.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_off0000b118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 10816 bytes
SHA-256: d4778fe1e9275ea8d5bfdb6f865dc86996887691d66cb1a278d8ce5aa4cfc646
font_01_sfnt_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 16792 bytes
SHA-256: 227fab4e6deaadd2faf0826d59f11b645dfdac4c532d726db6b0c332f177507f
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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