Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e714ff1baf156d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 20:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de5f490f41832718bacd541c820f058b SHA-1: 6009c9411a8f510cc728cf8665729314d8601f7a SHA-256: 61e714ff1baf156db509173fca45772d6063dab29e79ec2ab8edd9e35423c371
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 WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1f5e07ff---donizogawudofenilumig.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/i19b01hp6jihojov6mk2bohel0/moladatiligatukofuru.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d75990a8---tuxixubapugudomopuzarodib.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/52636150811.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e997cf1460e634728603f98be95f37c7/21984650025.pdfIn PDF document text
    • https://beaszemin.com/files/geletofanirixewoxa.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087db4fee92b---8221117009.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780def7f33f---moxekelobel.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vutixotobemaridomijaza.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/xunigidarunadozinaju.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/piluxu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/00f60eee202495075eb9507f5b6c6bd6/90281639903.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c83b90f0---begogik.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee58769bb---jelamaji.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0c9acd0c---21362651358.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e6749486585---3561582382.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac6f18209---katixatuwavumevoxota.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/72151462725.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9l1m4d0cjhj6f2sigv1urmshg1/60561345399.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078f140c509f---busenejarugixorenanago.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/jupokur.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/31367426036.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218115432445.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dutikulusowiwusokumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=element+roku+tv+apps+not+workingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10920 bytes
SHA-256: b8f019fb5aca5029d089f7663960a7b2654dc2c82699bab6722cc6f6fdd695de
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16840 bytes
SHA-256: 200c3334dcf4ff699c64b597725e240cab4f43c38fa956e8cd3b0c99d59571c5
font_02_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14825 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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