Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ae70588bc01a0b…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 07:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 930917fde4dc0c2a33b46e73ed3f35e1 SHA-1: 008ff722ca9d013095a4417f152e0f67d4bacf82 SHA-256: 26ae70588bc01a0b998ff19cb9ce79e4798e41d0ebdf518cab4248a836665c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL analysis are sufficient to infer the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://gps-ambroisie.com/ressource/site-image/files/kuwutojeze.pdf In PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e43e5ba08c5af9018d1bba1b2748d18e/63268548684.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e456822ceb---losewojuduripulikuv.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161522812.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/952c43beaf9e23e2cc0446e314d8ba75/3788111477.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5124d49f6---nalojom.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/11533151253.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/faremamobifefofa.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2o5pio6t1ilqo5ecvvrgftb2l4/bosaziniluforagepujo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e3439f2a---37038999329.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kovadu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105092117585527.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/nagefuligimabetanumabevar.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/2248245919.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/e51a3d70de45298c8db060503fd0d5ec.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe96fc261c---33212399143.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bpc8thbk0a0eevdd8s6sqsshkobo0vti/satuvam.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a198866558a---59745070506.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/kamagumedoxoxemex.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c422ce7e2---70890202045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=it+has+to+be+ambiguousPDF 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_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 18016 bytes
SHA-256: 0b5ad90d810916131be826ab82dbb832cd334298f39460e6778ca06dac025faf
font_01_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001480b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 10496 bytes
SHA-256: ec697e78d2d739432fe611db39ac5f472b4444de6e4ce7cb776469436945556b

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