Malicious PDF — malware analysis report

Static analysis result for SHA-256 1011c7f4ca5e1682…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 14:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bcd8c7a4f161772637aca19d4b2257c SHA-1: 6e94a32144439fe775a2bb0e6c21b796947f9387 SHA-256: 1011c7f4ca5e16820a1efed6c00c90246fc16ec54b01c993bd796f89fc71a70c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs. Several of these URLs point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://anaminfo.com/attachfile/file/37049330132.pdf
    • http://aihyang.com/userfiles/file/72810338566.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/romilokubujutowopenuti.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/funoxigivibagevulomi.pdf
    • http://arcomproltd.com/userfiles/file/tabalip.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d811c669187---giwumirowisutaw.pdf
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/8cuu881ebmctmarlc474f8r8r1/75779439714.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/getafulugo.pdf
    • http://argol-editions.fr/userfiles/file/puvotuzajofumenuberatuzok.pdf
    • http://forter.vn/hinhanh/file/sivozujarikorigisisudeguj.pdf
    • https://master-service.ro/images/file/gipuwozufajomifilof.pdf
    • http://needychild.org/ckfinder/userfiles/files/mizilegamuxexefi.pdf
    • http://mwflower.com/upimagesfile///vasomijidojezope.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ad77bfa715fb8f34a0b19469c4ed2651/jidatoxivetopefapepekig.pdf
    • https://www.idd.no/ckfinder/userfiles/files/kizesoxomapoxit.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cc7b1c70c---barorusimeboxutexipu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4010c11add3b3d505da34717d8b8fb1f/37111170658.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcac1b1c49---nopolokumijitaw.pdf
    • http://criminisiepartners.it/userfiles/files/fejafejidovexudosum.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/wotafibekosupevowuwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=entrepreneurship+innovation+and+economic+development+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 16792 bytes
font_01_sfnt_off0000f688.bin
de197e55b772fa2e41510862ad8c94fd08ee059d2d184c5d6f46bece2a5ae995		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11036 bytes
font_02_sfnt_off00010ffb.bin
64c51c26e1e049247268461f6a70ed97dc97aa18a3a53f71a76f0c3d7a513745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 18100 bytes

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