Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e98a465b14810ec…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 15:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9e70e0307e42316b3685128d3c86c30 SHA-1: e18d3b11236c2c9458018b06962b0cf37848d124 SHA-256: 9e98a465b14810ecacd3ba10a99a3a002b8ebe8db3cdf4f00faea744a24bbcd6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and link farm heuristics strongly suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://85097781.com/upload/files/gipenoju.pdf In PDF document text
    • http://jatechkj.pl/upload/fck/file/rajajifogewavasaramiruji.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/tifurifunekadi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/15dcf40651487bd4b8bb275fce874fc3/65553373829.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/nabavanuzufukadeza.pdfIn PDF document text
    • http://marketingnews.fr/images/file/pubabazoxomobuzafik.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/73766ee1c47042c82850447967da434c/21298581714.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/34631276856.pdfIn PDF document text
    • http://dztechfin.com/upload/file///ragasa.pdfIn PDF document text
    • https://aashianarealty.com/file/40718197260.pdfIn PDF document text
    • http://abwrva.com/uploads/files/jufetunonijonag.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d244a67e---baluxosatinojo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/piwiwobexovitifipagadi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b9f77dd24b37798c90488a0de21aad48/99006204403.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc3e29759---xagovi.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/15943324465.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/10986302320.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/53079083511.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/58075626167.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/71591412486.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061100501373499.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/63544417656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=improve+writing+skills+english+pdfPDF 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_off0000c24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24A 16472 bytes
SHA-256: 710d1bc3b49a723f3079daab06c4690be36ce4df13ad9a3edf9f57a1bbf839d9
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 10980 bytes
SHA-256: 1ea7311d4c5b4f2d1d3073d16152913523be9afa8372de611930a9a32e847527
font_02_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1