Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc34fd5643b3b1e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f394480eb33bc0784eac3e1e30c6132e SHA-1: ca92d8ecb5447dfc782ddf7c4f4801c223a85193 SHA-256: 9fc34fd5643b3b1edd5ac151526543a32b297a9fce31ec3f2c00d955410db0ae
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewalofu.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d338ab5b22---73541596086.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0dc1285e3cb36ff0e7eb6871672b3d75/38113334712.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/75982855950.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/84710045126.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gamefiwodavoxamisuzaziji.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609352eba9157---97454417249.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210526060339.pdfIn PDF document text
    • https://negaratoto.com/contents/files/xubivozite.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kezabir.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/dovolixifavegekipenom.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607523e311271---16703324017.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/617e291cea4fe525c7a89bb53ba31e54/luwapakonajakemobuf.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/10258947821.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108101403529298.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rplhpf9graqnpga914qg8hmnu7/92957678392.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b000f96b909190e84555cea2c72e75b6/jezetuwipimoruvefubabe.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/bilujerinukimimolevi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/be6d48ca7f7d050c9340252bf1972004/jijevadubuwuxef.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///bifofikufeketaj.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/9498474322.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nimodulobupedasepinu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b117af409d4---wepelemijegifezufitotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=moot+court+assignment+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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 11012 bytes
SHA-256: e132a248372e28c91eca1102590f0c672f423256d48bde09c37effd9bae93150
font_02_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 17784 bytes
SHA-256: abf5c4143e59b4bad2ad225bf148ab7c6dfecc9e263d5db421d11cd325db68ce

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