Malicious PDF — malware analysis report

Static analysis result for SHA-256 979fa945787cee7c…

MALICIOUS

PDF

90.8 KB Created: 2021-09-20 00:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eb26007be283be22b0231b68d6ad4db SHA-1: e5fe0f61a2e7ec4e078f0ed35ed98eb68fd153e0 SHA-256: 979fa945787cee7cd87abb7099073b281045191b5ff4eee2379b6469e0c5f9a5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://gaudi.tw/upload/file/73126474398.pdf In PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/96053019002.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/efnst976cobve9ajhq693dj1np/befusiniponipudelinikidi.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/92475492143.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/48407643604.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a331e0d7---40489684127.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27910551419.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/10270710766.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/72530080710.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/26341019467.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109082020219987.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/27909804799.pdfIn PDF document text
    • https://cicimanis.com/contents/files/nefamum.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/fafem.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/38985539009.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddefd42df9---33362762332.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/64207262345.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doniratagedavido.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/nirudefefevekufamuvinere.pdfIn PDF document text
    • http://ministerium.pt/files/38890332951.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/97223664755.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/64964149118.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/17697592325.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7mjh5p26iqlpquf4d020ok1ei9/lagobogomijuwepat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=julius+caesar+study+guide+answers+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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 18836 bytes
SHA-256: a60fc4f4f1070989814fb623ba6d85c4ecab6f25df9e8263e7a3149e219c507c
font_01_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DE 10964 bytes
SHA-256: 30cf8ca51f827c0a6d89f4b910a00fdcbea43da40fefeaff30e929ccdd7591a5