Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43f0dc6ddd6591c…

MALICIOUS

PDF

76.2 KB Created: 2021-08-19 21:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c2d06965f52b415d3d8d6d4aba634b3 SHA-1: 4b09cee3cb74c6a14de8e91a9f1353ad03803832 SHA-256: c43f0dc6ddd6591cf151b49154c58e75993c66f570caf3adebd70fa31ee0a4fe
116 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. One high-priority IOC is the IP address literal used in a URI, indicating a direct attempt to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2e1d57c2b---3239392487.pdf In PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/44168549803.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/magafizamutubalagimogu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e3a1d5a31ed156d2e4999cc0cdf29bf9/30758221244.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9dfbe018f---47370945527.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/25058497981.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9c8f4b9c5a18b4dd1e39059cad9a74d1/19629805434.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/3940150854.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/i5n3k91siafamf6754mieacpik/43058730894.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1059cf0ffc00dfd8d005a4de226569d8/gijajajotogufiporanarojos.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/bawofamujolegopebari.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079796997a04---garagixobe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c5f9e4e3---kateriz.pdfPDF link annotation
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7646ae30e---42896118716.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/eba6188bb331c1625ded3ba7c5f5baf2/betavujuposo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210630052327_rgjasv.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kamazafisepuzifeja.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a2d6a9f7f---dutuvalam.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://paoladebenedetti.eu/userfiles/files/3821868745.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/miditiwidijim.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9a1db0416d65e22d3f5bc37ac7b5094d/64184904772.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jadetipewinezibaworanu.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/vometamusejup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df506f77d---41002671387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=janapada+geethalu+songs+teluguPDF 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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 16092 bytes
SHA-256: 1c3ec0690b6f4cd9111073ef50f36eefda0cca1d7748f3f8a6e825473342edf9
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10568 bytes
SHA-256: c7c8714c4ffdc57748aa59d3b65e7e46504b7d03fd6956cdc0bf6153dcd9a356
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1