Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e98fc8dae9ea515…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 06:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fb90b1b22e44682348f11853966d9bc SHA-1: 4f7f95f555e112175702a41b7f6d1bcc5bf3fc8a SHA-256: 7e98fc8dae9ea51571de008dc30aa0abdabe9b82f326b28157d72e66b0828ebf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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://rockefellersgold.hu/editor_up/64416034114.pdf In PDF document text
    • https://telorgabus.com/contents/files/19681792665.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/45138857783.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/bikalekotedideza.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d45ccac---zusere.pdfIn PDF document text
    • http://mq-water.net/upload/33108327825.pdfIn PDF document text
    • http://warehousetraining.ie/images/pemukazuteratagezow.pdfIn PDF document text
    • http://calisnt.com/uploads/files/36462988146.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4fc1c864---34721413629.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/mijafejatogafifuzuj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404a7f8907a---35750428846.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/68444473946.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/dezokigikurison.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/23783312686.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/27041802744.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/lixameso.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/wexuxurifusolijevali.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/dakumalibetobegeda.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zorasukatarefavip.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210915214328455.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jeviw.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • http://edituj.cz/res/file/71599149422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+geometry+dash+songs+2020PDF 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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10964 bytes
SHA-256: 608a5a21ede3eb324021c2af48cb8aff22451a72149bedd8d125749efc5b1283
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 17964 bytes
SHA-256: fa704e4aab0fd3da4338ab153223190b431ed719204c02edb4ae3cbe5133bb0e
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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