Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8efa91e3c46665…

MALICIOUS

PDF

105.8 KB Created: 2021-06-14 00:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4b42ff53cf37c6e5dde1d0d586fe43f SHA-1: 3fa9ea38e61bba17ad3eba8897a7b5dadb8815d0 SHA-256: 8a8efa91e3c46665d332f2d91416360f6aea138ea24802be8f4065498bdfbf45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'verified tick symbol copy and paste' and 'wkhtmltopdf', likely serving as a lure to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=verified+tick+symbol+copy+and+paste PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1f0659d0---banunidaxovo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b1549578---81080983995.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/650tolde7ubgle9in6fnd7ujko/94234456229.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bro1i1auvm99r2hf94o1p4lqd4/dibokutisinegipini.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file/%5C/2021052507570839.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2d166a0c---goguriluzeleviwi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7703912f0---13908392168.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5403e71c6---95030354853.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b4b0658aeab3083c86ffd3db4f4d917/700344459.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/88ks0dcqfekurmgjkbfkeocgg3/sewud.pdfIn PDF document text
    • http://abpaluso.com/upload/file/warojokevujorufubox.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcdb99224e8c73107b89a5c14cf2ecb5/49211367845.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd6f67bb6292da18620a09aa8023b3aa/kadubikig.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/37776538564.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad476cc022a---gevejubidam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 6968 bytes
SHA-256: 2d6e692368bbdf0cbecb843707f399ceb7b8f85bfd20dc5223ca942e9b03918e
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 3016 bytes
SHA-256: 5e5c097edf5d434bdbcc876558a3fabe76c4cca263d7a1ce4cd06276ac4978e8
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 5572 bytes
SHA-256: 0ef100bad9f68480fb20fcef01c78685099c6c3ecb7d357f991f446c9e408949
font_03_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 9992 bytes
SHA-256: d57ebdc7c159671718f3343ab647d907f70914d084b6592f3e9f8adc91e2f383
font_04_sfnt_off0001525f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525F 11472 bytes
SHA-256: f66aec26d46366e3f1d9c38a4cb9c2f6b0fdc6429d632db61fac262a4dcaebb8
font_05_sfnt_off000179b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B9 18324 bytes
SHA-256: 106bbb5a9c52a540510f619293fd6b6ee92d99a3a627aa888859c61f6fe4120d

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