Malicious PDF — malware analysis report

Static analysis result for SHA-256 7598eee4d0b29e14…

MALICIOUS

PDF

90.4 KB Created: 2021-07-13 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edfd7f038d22a560f07703bec028991a SHA-1: 088b9cc57d35c50eaff3ffd64bb66c8ab828e9d0 SHA-256: 7598eee4d0b29e145e31039ed3c6fe307a183a83ee919ba05cfaed3c396f2588
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to redirect users to potentially harmful external sites. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristics are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tano-cable.com/d/files/40357707163.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d8262a76f3e---sodulememuvexezoxo.pdfIn PDF document text
    • https://wrd13.com/force/file/ruguwudizatetininav.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/19bed78b30fab3e1a4d13b3486e6c7ef/soxusifekodizamikowaxim.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/cecf833e0b382cb2458e4cb82cae59d1/detifof.pdfIn PDF document text
    • http://alltechsro.cz/files/22049780214.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2050399275.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/suwopipofujejo.pdfIn PDF document text
    • http://hasyo.net/files/file/36982633805.pdfIn PDF document text
    • http://brlairport.com/images/file/fututomedogu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d240833753e---28706542379.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kofonigomatajar.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/29285241466.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifelijivixarojajegagi.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/bejabiliwigowefojojol.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b383bd8ae2595723ee4d2be29e20c503/37117821165.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/69543405690.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f41f452c8---65634730863.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/65210ad80eeee728f536b498d32c91e8/21628725927.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4dd2e30b---49407289068.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/peluzonunejixinuj.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6b92d633c30bf4bd33099eedc896717f/27064955745.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a489b1ca---fudixapolizobifinifakuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+out+who+is+unsending+messages+on+instagramPDF link annotation
    • https://mediaget.com/userfiles/files/93237339818.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_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10932 bytes
SHA-256: 0e037547523d2a59b6c9897432e8ce70af2a4318513911c58fe9799c88e6417f
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 17208 bytes
SHA-256: 1fad01556dd1ab9852b2f28584b6df73ac28dce0482e2ef46996f2f4c8af1709
font_02_sfnt_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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