Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63edcd82b97f1b7…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 12:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2c421cc9283515bfeed09a976e5524c9 SHA-1: 4005cc52d578075c1ce483daa2e0384577e2dcf4 SHA-256: f63edcd82b97f1b7e2cc74d68bab02e7fa4a6544d1e0e7e46fcbffc548172c97
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS upload directories, indicating a potential distribution point for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/85147848630.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54b17effa---15200579619.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rivanebolejele.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/kajawesalotofuzububig.pdfIn PDF document text
    • http://topas.lt/userfiles/file/12631428541.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0c557153b728aa356bd39d404a282166/5849508948.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/6aa1f82a401e246767b62efc8a60382c/4361460546.pdfIn PDF document text
    • https://medtek.vn/storage/file/fuvetu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b701ee6---mekulibojipezumid.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/61801285076.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e46351e9---93594649380.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc128352984---73935393365.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c0087c296---71391084333.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f20a1b142---57580546334.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d49aad13b---valamakigezor.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/51114501567.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f5207d5c998bc0c786760dd8ef8331a8/kuxudosunejudibur.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/46394097013.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a595617b10e---79882550163.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4fb3521d4d6e7cb7865ae531c0c96794/11537314996.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5c300e574b42a446bf68aed08db452ff/gakonulifofizivutod.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/71230737572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=writing+and+speechesPDF 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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16712 bytes
SHA-256: b8ef088a4b155f6e62ff23122be30107bbd4e510241f4132a079394f875bb2bb
font_01_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 10620 bytes
SHA-256: 789334c85318d0a6a470715d619b907fd04b2f26afaf796c3526c063d3778a82

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