Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cfaebe11fe6a81…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 20:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2df3c0b589d4e0e10adaf464ac37190 SHA-1: 6c88c494c32c9919a32dd802c8234233d9937963 SHA-256: d3cfaebe11fe6a81e56566b7e08b27c170800a38ebd731b5f9aabc3ead7e25b5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=luckington+hymn+tune+pdf PDF link annotation
    • http://bjallstar.com/upload/file/82269970155.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5fe80ac14---datitajawazutajubiw.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/43167064767.pdfIn PDF document text
    • https://bonacorsi.it/file/68773128932.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nibabutefujom.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123f25cf1b08---72717006887.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/23847360641.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc35b8b968---kozolawupa.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/85d702bfe5ae19104e0eec441fce35d9/sewijiduwomo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74e198685---fopexuzado.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/31101769819.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/93848957273.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f66680a82---zezuxebitud.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a2048c4e1072c0123da16dbf076ad96b/88344223120.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vututurunokukakexiravaz.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/31631085397.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc41434779---zagebukibuxujusifegani.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/ponowifenujakikorem.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789efc3375b---pojasalazadefonazaxov.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nixosaxeboj.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/29074390597.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e83e2f6d512---fajokafagojuxapesag.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9cbcb3de3e7f6cb92875bdbafe9c90b3/45782389988.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8e9m81j74r5j0hp6cs7h9hah3f/52731370661.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b2b8740238bb088a380e87cd1319b3d3/gotadewujapo.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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 15840 bytes
SHA-256: ef1d4b0295d44b925f434d6825280c39d2642f09561029aea2a74bc61d048fba
font_02_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 10856 bytes
SHA-256: 04c9f7992bac40d0f1c1748dc4108bfbabc94de2a9fea956f1654d7e2d05b3e9

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