Malicious PDF — malware analysis report

Static analysis result for SHA-256 488cf75465b2a276…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 07:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa014bf6fe5f891c4b42abf6b0ea470d SHA-1: e1c2feb10d1959a1bcf3aed296b2bd5fa636338f SHA-256: 488cf75465b2a27679df6be24d7e1d233b0303334f36f85a810ce6c32e905f17
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7a3bcce4---jesujage.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a56arh88ve9vvaj7aa1n2u6bs6/10721530254.pdf
    • http://ykzn8.com/upfiles/editor/files/gimupigakaseg.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748cc30de70---wukigumuzudejuveripifo.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae55cd456---larewibuziji.pdf
    • http://ropesadventure.com/d/files/fafanewawaraduzubemelele.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c5e634ea---33871797160.pdf
    • http://synerfreight.com/syner_upload/images/files/27744532876.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/jodoborimidasumaveguv.pdf
    • http://www.motionmantra.com/userfiles/files/57239535680.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b310ca90b91---malimexosenupilo.pdf
    • http://mueblesdepladur.es/1/userfiles/file/10390783422.pdf
    • https://al-farh-iq.com/upload/userfiles/file/ridazomoxesupimat.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/95ac775f7a5b396698400dfecb8e3285/vikusonoxor.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd143bb8e---duxona.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f213577d---74842416913.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90e4f35107ef28627e2356d42dbbb00c/sowafinalewedodolotafazi.pdf
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/15828776702.pdf
    • http://irk-yoga.ru/upload/files/demewimomiwufixekoluxad.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2fa5083d5eef156a608eb253ce8ecb7b/wafitejezibebajidep.pdf
    • http://allycatering.com/userfiles/37772169427.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143f71cdac---97894592727.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=another+name+for+gateway
    • 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_off0000ee89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
font_01_sfnt_off0001069b.bin
71bb16fd1999b53f3f93c58ef0304f6d7c7d7ea508249d3bae536ef596640900
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 18052 bytes
font_02_sfnt_off00013655.bin
f7f6c23d229181fd18d3ae1a7349d76933900654269484d091c22118e02de0ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 10536 bytes