Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a705ab3fd042e6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92bd35dfe7bfb00b177b9d1033811fc9 SHA-1: 35b79afbd19c9f92d7eb6db03d1164b89cc075d3 SHA-256: a7a705ab3fd042e63efca96689f1777f030a80f743e8f6bab95dbc18b7714373
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads or hosted on disposable domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious or manipulated content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bfae5d50---noponekixiwulufujonuma.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f086095835d---8050142304.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/lowavililetap.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/18607150406.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/nutizilopidoxobapetik.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/74805318644.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d1b5c654bc6e2ed1ed1c6e2ce8638429/xerozomomafuribabewa.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5aca57b7d80912a5143916569f103318/56767206574.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/36818656572.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd63247d155---binilofesesonis.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae209583e---lilixojawomob.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/33207392906.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/welozadakuvuwazijomawebi.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/vukomomoruxeduvugina.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee711bd4b2---8792397828.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/nupokopisikivubat.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/uc335r0mp1pcc82pn8ohcqon6d/semefaxunudotijalagusob.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/33201709757.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6199f2ce7736980001c5f67fa5be11b5/63402737560.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/podenufarudelugodeboxa.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/jupobe.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/96245261980.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/beaa8ff9984c1820ebe09513143bbb95/5562473479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=functions+of+several+variables+wendell+flemingPDF 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 11188 bytes
SHA-256: b9ac2769ffc32bc6e99d83e2643940bb7f8e1d936184eb43e08070967234183a
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16988 bytes
SHA-256: 7e0582fba2d462611c64dba0c9d9e707bf0d7f65e64a2c9a54f7f86087ffc099
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1