Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d441ac215789e3…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2a98e7221841b880fb4caf5b9b3c7e0 SHA-1: a62bb9210763768a106ed3e57047690c5986c8c9 SHA-256: 95d441ac215789e377d0fd03e34821dfb83ea90aca64a1a66d6b781303a30951
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of urgency lures suggests a phishing attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.mustwalge.ee/data/content/files/18754574693.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/wimisowoso.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/jamuzemojexodofalukini.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hp99fcmnh52mqk0pstjl7k41q3/nedadosukugaw.pdf
    • https://kompaspt1.com/contents//files/daduzufezabitekekivusa.pdf
    • http://augustaelectricalwork.com/editorData/file/lafonajizogu.pdf
    • http://busanpc1.com/upload/fckeditor/file/67322179726.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b2aa0645---26216000865.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/67241ad8b5e677abd43e69be5340162c/54480697200.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b24c69d47425b72da5ed07dd6e275b26/lupobetukenux.pdf
    • https://livre-art.com/ckfinder/userfiles/files/45013426751.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb74aa3662---wajunaluliwelanizisakabu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461685c768---80731460203.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba74a3dca---jutebumoxufusepig.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608980ffd3cdf---bawanikikomuwa.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bca7e7df6d3---81929441919.pdf
    • http://ingmontagna.com/userfiles/files/11641042471.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/68481597285.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/pebixi.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e752f5a4a96ded4508a82c8415ad6838/30209544815.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7e8a5673ce5ce93817d50f0667118dfc/8241951791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=risk+for+infection+newborn+care+plan
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin
b4896dedc858f0bb516448cbe24b84c2be39e4cb78851aeeb24a471879e75484
pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10836 bytes
font_01_sfnt_off00010a14.bin
b9920efe7c4d906bf81c0166862c7f837331d527e221deb0670769e02cad950c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16928 bytes
font_02_sfnt_off000135f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes