Malicious PDF — malware analysis report

Static analysis result for SHA-256 6685509443b1d371…

MALICIOUS

PDF

106.8 KB Created: 2021-07-23 08:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f381b71c5010e794431533f8937e005 SHA-1: 41f6ed2301c48fe5de7a5cac30a12d348267fc55 SHA-256: 6685509443b1d3711cd43a8cafa2f4d1e7b7cbf3acfd7fbb764a4044a458d526
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://soupworld.de/upload/file/27623485550.pdf In PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/91624968406.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/91842418173.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745070b43f8---xizebemafewiv.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051216241133.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/79970780386.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e34ace1bdc01e218c94cb3bd89bc92c2/kosex.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/55746407566.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/13577990361.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38b6c8cca---38169148366.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/47341444794.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bogiramisamiguzoka.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0a8ee1d35a87011d8158c0fa5dd039bd/72013290257.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/dorupaxorusomopapirigaxe.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c9a5c43bb9c62a7fb84d73715410268b/16945839642.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/7954067490.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7c85dcc9567d5cbe94ed6ecc61539ebd/rikuvijusodilituduxizu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e28dc593cdb---fapadewiburutowukon.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/sodumitexi.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/86739094134.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/15288980175.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a35f88619---43081806526.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160957169bbebc---97647238006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lion+tailed+macaque+found+inPDF 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_off00013d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6B 18376 bytes
SHA-256: 2e88eab347caaf8f9a45156c03a7d63fa9b63bcba7e7d84d8cd6605d80006cf8
font_01_sfnt_off00016d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18527 10572 bytes
SHA-256: 9ba0d17935dab0b32cb9ce34b74fbe863ae783ec07719b97fcb29b274fea15da

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