Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1e18b54d4f88a6…

MALICIOUS

PDF

105.1 KB Created: 2021-07-31 13:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8acbf199b743a9fa49e1b3bc16dca0d4 SHA-1: 6b68421df4f72d2e1f8297d96f52ab46a1d9ef9f SHA-256: bf1e18b54d4f88a626fcfa5cc2ca2166f9d24ecc4d291e64c535366ebaf5164f
96 Risk Score

Malware Insights

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

This PDF document is identified as malicious by an ML classifier and contains numerous links to compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting an attempt to lure users to potentially malicious sites. The presence of multiple links to compromised WordPress upload storage further supports this. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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 https://philabc.ru/uplcv?utm_term=what+is+the+moral+message+of+rumpelstiltskin
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7af6cdcf6fa82fc877a3eb50c65a5fbc/96540681102.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5d8bf245f1913780660b4db06377dcc9/52034400306.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/4868f8ec86b89c9f1bed153520005f95/fonivizesamali.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c71bd43ca900ee4219d219e7d1dd4822/25772416185.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fatesolawoniv.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/aoa1161isn8lrsqusg777i37af/dofelugupogudabanisixus.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16705b9b0---2266410415.pdf
    • http://yoron.net/up/files/gusarasikamadazopizaf.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0851c8efa1---datonufosi.pdf
    • http://americanewbie.com/userfiles/file/39654976826.pdf
    • http://toyotacri.com/userfiles/files/67436106248.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703a6782a30---77128287056.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e81eb1258b3411b9bd98681765c3c199/52506569041.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815facb585---ximesagibuvejuxizabek.pdf
    • https://alarrabnews.com/images/content/content/file/medowajoniba.pdf
    • http://getem.eu/files/file/neletiwubemaneka.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f7ro885icp3maabmc5rab9ib5j/fafokomuzovakozafedu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966111e53---zufupifarikugoz.pdf
    • http://chemonova.com/FCKeditor/file/98069614620.pdf
    • http://kgmda.com/upload/files/47996921092.pdf
    • http://denprokhorov.ru/images/file/59215040061.pdf
    • https://mdteam.se/ckfinder/userfiles/files/puxalamudezi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073b66f4dd75---56620727758.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58b49a742---28982350744.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/65674757150.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jftg8i17ufn9vll44cekamsun3/saxikokubodegalobaroguri.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
font_01_sfnt_off0001165b.bin
d8c81548869fe4a6d6d584b44ef0600e0ad22bafa971d079d361352174a18cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10988 bytes
font_02_sfnt_off00012fb6.bin
d714336056be02433475eec17aa652c9641286bede38b8a735e1748061a07710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 17136 bytes
font_03_sfnt_off0001493f.bin
f3addaf85f1572785a85ddfc479dac447a63fc9afcd73900f4b6cd3b3bfe593b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1493F 3044 bytes
font_04_sfnt_off00015600.bin
3df190b6d6a477c92cc2f5ee5bc3d66c0403a9f124cb716d7160dcb5d7983de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15600 25500 bytes

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