Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ef1445c7d685c…

MALICIOUS

PDF

83.1 KB Created: 2021-07-05 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c14b6b8035b48dfe7ebec05672acfc2a SHA-1: 191e1a87a55b306927a9daff5d2dc19a29320ee6 SHA-256: 099ef1445c7d685c757a1cce45b754178d02cb42e4a6babc64d842ae0a07b57f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=take+out+specials PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qf7qb2kt59jkugih4611bqjahp/84738472372.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/kaxobetituzelomikujubibe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/45612a1969333613b644f3b3ab74e0c5/45638310280.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/libunojagozefepamof.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c83e04d43---xozokaxekiwelapopezum.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xadutoviriwepifonalage.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qjak2bj289692qkrl6tbuusta0/81064914887.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7528c06f2---xudesuko.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/85079168040.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c2f2767a---dutenabinijewulazil.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/15255553476.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/9069275597.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/14383457526.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0d6023e64b20f643aab468633c76bbde/99379105384.pdfIn PDF document text
    • https://anfauglir.com/images/file/97505470153.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074650a9b7e6---22400472754.pdfIn PDF document text
    • http://artside.org/data/temp/file/73390445928.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sspk1k86mvqtlo72a3o5fig39q/64441097236.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b571dc75574---65805483242.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/df68677f408c8d8c3efeae5a0c11ca4f/35470905251.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kimupomoreza.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22a2030ae---didezetulamomiwum.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0db2267c1888121566d4c7e19be6e2f5/11556216949.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120158072854.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/34181940795.pdfIn PDF document text
    • 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10320 bytes
SHA-256: fe42ce782113e75c67fe5e5698524cde7183704caf1024590730314490bc6aa3
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 17016 bytes
SHA-256: 07e745a74c775d45a49b2be12cd5310a47672c5df157abe59ab1cf227981fe16

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