Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9855ea4135b3d6…

MALICIOUS

PDF

89.2 KB Created: 2021-08-18 14:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1adc89bca3a2e7974a8540dfb9fb279 SHA-1: 655e06db89a6402d4807c8222770cff01f80b682 SHA-256: 6a9855ea4135b3d69d20f247f3ea027561681acd3c120c91287238bc65548d79
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of link farm techniques further supports a malicious intent, likely as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://rahwayhigh.com/clients/42761/File/28962477824.pdf In PDF document text
    • http://www.stemcellhairclinic.com/files/files/71700002085.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5229e6d883d8241514f3d94b3851ab02/69366499727.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/52255830044.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30781a7a1e---zesopapepukufax.pdfIn PDF document text
    • http://amandamaitland.com/images/file/mozuvori.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pipinef.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/remopavidinifujof.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a183f1e944a---pusodimekadubuxuwujodofe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098772d5684d---4791291983.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75753e4a3418a265e3ce100bb75b0251/69317043234.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104760f0838a---57288074160.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/94987432408.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/vovowelonijoni.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hl03hapepiofb6go6e4mhmjad1/67910928353.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8fab82ecfc86d2a574aca2f3600f6223/fomixefalegixezug.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074394bd1910---3060886540.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/25ab0lds7bjl5uql9sk8cqvbon/pekekenixawuxuxu.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/sulufetefupeloted.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/gefipikasu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b43f2b09---74914749160.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/defutijelokidatoz.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1d1196d6---26599378930.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-3/20210603125404497131.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb15d649---rejosopomematubedabipeji.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sobimasaduzizebavabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=litton%27s+weekend+adventurePDF 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_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 17940 bytes
SHA-256: 8b6cb927aa6436c4e726318c5f9049e02c146aa5146643df9b9050555e414efc
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 10528 bytes
SHA-256: 40ba0e393b22e923fc4d6a5774cd1dc75f2d99c1bc91d2d07517448b0ab53c3f

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