Malicious PDF — malware analysis report

Static analysis result for SHA-256 a888c208b597bc4c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f8b324d3a2725cf67816f6a9e8c6daa SHA-1: da9ae89439d75448064b34c24eb37670b3eb348b SHA-256: a888c208b597bc4c77a5c284fe657fda161284b8f5b72357b7e6b24902de3ca0
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. No scripts were extracted, so the exact execution mechanism beyond the link redirection is unclear.

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 https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/21imminlesnjbe9ooscb5qnnp2/96054478359.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7e0a78ff6edd2a10b624c6ac4318cf6b/92037402546.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611848d062d2c---napubilidaxo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e108a44ff1---95695255903.pdfIn PDF document text
    • https://morabia.fi/images/file/1873379296.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/15247312136.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xisawulokepow.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/620dnol3ag9j755brah9k13977/tawizixewetaxid.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/sipamafowakaxenoxume.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/45036566327.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c201a49d271be98a8f9a0e4af2d7bbcf/punidurimilurezijina.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/bamawugukepepimerodaxomom.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b825b4808---jupotuxonuxejasupewi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610062eb25a27---11864176335.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/1tdcm0j5v40lr1fg9ta98kndp6/dolemosiwapiwezikubi.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/biwegam.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/85384228093.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/govofixefipititoma.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca450a1ff9---xozopifabeja.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/1043966959.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608824199eebd---28625778902.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/xazimamiwizubapuriwajitaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=use+of+robotics+in+healthcarePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0cc39bf7---tuxojukutafafadikufi.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 10580 bytes
SHA-256: 208c8a7f1b706f69bf9548b877e4725e0bafbec777fbf387980b309fc9cdb80b
font_01_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16688 bytes
SHA-256: 26acee635562cb6faf6cb6260387bedfaeb0a1ccdbe8ce762a43a29963c5bb6d
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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