Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b42c72e1abadd1…

MALICIOUS

PDF

84.3 KB Created: 2021-07-23 15:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ab4ebd5293ed6f2227070aea0edb67e SHA-1: 83b66ed82672e1f710581418158e003c2e3ced16 SHA-256: 44b42c72e1abadd15af4efd026ad6a86b69c11aff3ce5154d6b0ae5acf06958f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb2927330---62972811398.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b801df9b---nagekepapo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a963c7e557---53925647941.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0c074e37---zeteziloxiroraj.pdf
    • http://alituncer.com/userfiles/file/41175881636.pdf
    • http://arch-teh.com/pic/userfile/41597048460.pdf
    • http://ahkjt.com/upfile/file/mowezud.pdf
    • http://heizler.hu/files/file/rozafoziboguvogugon.pdf
    • http://fence-alarm.com/userfiles/files/1922689124.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083faff9bd35---fobutepixadibe.pdf
    • http://eva.am/files/dcdae09d87861f7c.pdf
    • http://rasmesafar.net/basefile/basefiles/24523113503.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/finodiluvoxopebadepepidi.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/14310551345.pdf
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/89757449512.pdf
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdf
    • http://stonebreaker.at/tifazip.pdf
    • https://callmarkinvestments.com/callmark/files/gomovoludujuwasazapatum.pdf
    • http://red-persimmons.com/upfiles/editor/files/93281368729.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/8lep3kagm9dlvf95hdtdn0fb7ph7pa85/rixuwosaxurudiwonabas.pdf
    • http://www.elstar.ru/uploads/files/dumowedekowoladoro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rapport+de+stage+3eme+page+de+garde
    • 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_off0000e423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 16792 bytes
font_01_sfnt_off0000fc35.bin
c2a74cff2878b665f5d1d1cc7ac7106c9095a1a1d00f81a31ab3a3334afeab49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 17972 bytes
font_02_sfnt_off000128c2.bin
4d35784e2ea9f34e3b0269ae5c83e6b14bf4fa40f6e9278f4f3429962d9ea9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 10712 bytes

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