Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a3fbc743a4b418…

MALICIOUS

PDF

92.3 KB Created: 2021-07-21 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6008c26d21803d846a7f20396cbbf735 SHA-1: 5c68a00befb3e948eef9a4fbd1dc30dc2601b101 SHA-256: d7a3fbc743a4b418e287f036b2a22fa4b4b19858c4d26e43e29dc94e37c55301
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various compromised websites, many of which host other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c93d5aab36a9eb9d5db42fad05abf5e2/75233699927.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/39e988ca09ce22be00205b7abf1d4eeb/xigibubevuwalazunulosux.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4de3a7269d183140e6c9ed4bdc60f3fb/robuka.pdfIn PDF document text
    • http://www.asslar.de/downloads/26865520440.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/12557387785.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/nidilugovukedojivogi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1gh7v45a6pasj26od1mbha7r55/1808782673.pdfIn PDF document text
    • http://sam-global.info/files/file/gobawisiv.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079529a2bbfc---22442936527.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49f7d1fa1---95396807616.pdfIn PDF document text
    • http://protok.pro/upload/files/pisujujepus.pdfIn PDF document text
    • https://allianztc.ro/files/file/sukizuzetexawiju.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0390a6eea---56768004335.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0qgk2rol26kfghbuuih53d2eeg/jariditasimijijapeguro.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2lk45ebqd3k15bagj885ve89sq/92400089098.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/49396784815.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-1/20210701182811609642.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/26666904856.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///nitabedulogo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a0df9793289---wagokilasaveju.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/82750019357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=knee+moved+out+of+placePDF 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_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16860 bytes
SHA-256: 8da3873bfeef08e945c7ae8c6ea4a03afeb483fc221e7e4af95d1072024c007e
font_02_sfnt_off00014c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C01 10580 bytes
SHA-256: 97e2860f4d5143dc4b80d94b6c560f937fd49a3bb45e4fdd659c60f40d21d8d5