Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3ded5ddd344fbd…

MALICIOUS

PDF

84.7 KB Created: 2021-08-31 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 257034378a7f2b88bd98d9aeba4511d6 SHA-1: 7a8e57ca52f8cbd15ef4405c2dddbbd6e57b6db7 SHA-256: 1b3ded5ddd344fbd6e73ade0a6a178a1c642e34d7fc0c2b0e4fb554558176f84
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=driver+booster+full+version+free PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094c651d5bf9---78787315517.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cfbe1bcfc---supak.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a5d02ea6---vamosixusu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r8pppcrn1350aqthbthvpbct60/85252381172.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d92daaad---zamugegimudo.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/27118150353.pdfIn PDF document text
    • http://afro-safari.com/upload/files/47840604898.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cc23r7a67mqsdmr50492r51c5c/82258383589.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01343f0fc7---wugizo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d61fae693---siwedulufatubasikilugi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb8ca9e81b---62657589202.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c2bshs0q0v1aldj59i94qg7vq1/53434097216.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/desijigojobowasubodevama.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/polofovale.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/kagaso.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde012d90ab---62177122493.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/12450433345.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00d68a0331e149d3c6030cc7903706aa/41023874350.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/sapiforofavafil.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7j4i2jmhogo4f5s7fcn4i49b05/91307887475.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///lotozox.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_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10352 bytes
SHA-256: a2b7969ea385df239489202b46ea463f822097f4f04caf5ae9c5c4f3363ff165
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 18308 bytes
SHA-256: 1e6449563c876209e1817cfb94ee21c2bd2abfed6f87a5eb57119c09076c9ef5
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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