Malicious PDF — malware analysis report

Static analysis result for SHA-256 55216abd4a0393fd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 09:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d94511e1364c09c2e5f7169b0f113a7a SHA-1: 1e361c10acb9a257def8d6e4232e4617d4a25442 SHA-256: 55216abd4a0393fdef5c17997ade8ec9f74e23daa450cc71bd5b66e00b806ebe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it could be used to host or redirect to malicious JavaScript or other payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vititanon.com/user_img/files/sijilekogekerumebapu.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tekegajoxetipupizulad.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5c142d352b0d6fa0720c7e90d8c8c6f/54559775748.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rivumaliwivedodaxar.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/4299611128.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jagekebuvuxakuxarivele.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/86446726756.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/miwibetoja.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910121420.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/texazoduxuloseb.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910115332.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/50346672345.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/witaduxuzijew.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/31289008306.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/zijaropato.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/vevedalenovu.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/doposiwum.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/vipunijutikevazizosa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d4e084c65---54779717302.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/sapekodanuridojofo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1e9ea6bf---dutejazege.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/68812790992.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/78894485363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+fgl+proPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/31600947739.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 10352 bytes
SHA-256: 5ca650253432e1bdf18f9909444684287855c3dae1f805cddb2fefbe56070e87
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 18600 bytes
SHA-256: 369c5b4192a7ba3ca1e5dc76a73bdda8547c61e27228355cc0aea2edcdfe5d21

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