Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8e1c69d1c79328…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 01:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca6e80cb7631529d60be8e4096b430ed SHA-1: fb9120525d4c9ef2df7c169588d2fd6fb5e77e03 SHA-256: 6b8e1c69d1c79328854a900b9bce6967f9d054b8dc50505d824bae6133482c6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links pointing to compromised WordPress sites, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of multiple SEO-poisoned URLs and compromised CMS uploads points to a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=anemia+megaloblastica+sintomas+pdf PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d26a1191e---4196766508.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b17ed37f2---80240037821.pdfIn PDF document text
    • http://popeyebio.com/upload/files/94619171167.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210607112944.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/redufukupipu.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/serixufamexewexuvikujabig.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/417e15a10488d7a2518b2c036472d7f9/debapetuvewo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xojajafixe.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tn4c56e9h58rerll8fg24irf91/miwijo.pdfIn PDF document text
    • http://ezibra.pl/upload//file/sawubimupevixasefez.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0f74393a959ab2efb5766f7b8f7b2e06/wubimi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a703abd1---xumudera.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82adbcdc3---nipase.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/85131001614.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/xilejefegelojowi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4995e7703---52233576960.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f4d628207---26915335640.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/94838253783.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a00259d035dbf0b63b5e406e1b371a1a/17636906354.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/90330252223.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/139b25c38d9589bd780575abbb4112d1/34899634486.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/69366296285.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/78703bab20dc69f59a5b4413ed7491ea/nenoz.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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10984 bytes
SHA-256: 0b2e60a68f9fa26ac3dcc018f061082c7a7b7188569b069e8a5d1509c8f51400
font_02_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 18512 bytes
SHA-256: 2a04b135eadf3ed943aa624afc5f959bd169dfb05c844a3f32b5c6077e4c65a4

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