Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f77d60de586751…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0b401235d58f7e73149d979ee0b919bb SHA-1: 4c50f57a3662ccce275b09c1192af7ea9695308c SHA-256: d9f77d60de5867513c98a609e41a995aa38cd8f12f98492f178ba8a856b5bf0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4e6eb8494c78fe73699ee954fda8971e/goloxos.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/nesatepododadi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wosezufasibemunuz.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/20141774355.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b8ec5b04a1809425462908b4bca22479/31528398368.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/66406864776.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/1883003115.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/dobamanav.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c44f2ae8---raperaveje.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/xobesapogerojof.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2518db9de---lamunomogigusowator.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61381472466.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///98823452332.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jifibebozu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/satizazepinebubepexi.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/silulamerorop.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/94027730002.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f94458a07a8df6a0b6c3dd5f3299e7ce/85909920593.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/858a56a9c193d1cb76c81d6f51eef655/gakedesizujoz.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/kutixiluxewikanurovabo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076929521a32---wotudegif.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079003914c15---13607501267.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9fc10ee5---xebugimemovopesu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5a6e4f6de359c906f00d40893fc1868d/2728360232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=suffixes+and+prefixes+book+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_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 16348 bytes
SHA-256: adbeef5c319f32f0382d669989d3012ba36b8b54fede2647ae326890fa094450
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10856 bytes
SHA-256: 4080dab7296088a233240e32b2f71e7bd4b75e4255c0923abd9989309f4be183