Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6ff2dad4ffa994…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 18:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7becd7209bcfdb6b89427bfa9660e1e9 SHA-1: c092e48004bdc3f0f2c81b2701cb9eeccf5ec175 SHA-256: 8d6ff2dad4ffa99494b9ca394384fd6b94515acdeb68a0f80c95562edf849180
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://philabc.ru/uplcv?utm_term=algebra+2+worksheets+pdf+with+answer+key PDF link annotation
    • http://ytlcases.com/userfiles/file/ditidibiloxofegiwinegag.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/fegab.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/rasutipakak.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/jexasaweleb.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/58315319172.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/603b785036a27a32acf5b7fd16594f18/94374097021.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/ruzabafapuxuzimid.pdfIn PDF document text
    • http://chromoink.com/updates/file/85754299965.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/92224895382.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/45ee191fb35bc911bef9045b01693521/91090159993.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/99453163191.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/powuzutopopovupopariju.pdfIn PDF document text
    • http://ruresept.ru/files/file/7521706166.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/ruxif.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/dureromerilebetinuw.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d24626---67459764563.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cbn1jho43cu1936q4fv368m79i/30371777497.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/18757345970.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210914150037.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191225677592.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/53491203428.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nedaroked.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 18080 bytes
SHA-256: f506a8c2d53658667c8f86fb7cf7014681d46cc6c33124add08efcfbf4640381
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 11312 bytes
SHA-256: 17fb8768b4f778c1af559cdaaf2be93b8c9382676cc3ce344fb45f2d4c48e8a0

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