Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8b6b55e7010ef1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 07:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ece184635ef986cf17772fde1260aab4 SHA-1: 14336fed5262c0435be8a72cae7f5a9305d4d238 SHA-256: 1b8b6b55e7010ef1b3ae905af351fced6c428e35681624690358c3e49a6346ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to redirect victims.

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://chcial.ru/uplcv?utm_term=objective+first+student%27s+book+without+answers+pdf PDF link annotation
    • http://besteva.com/upload/files/52713614878.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/74920102192.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/tupulotezasu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b553be2da69---zifuvabefijebasulatijoz.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/lemarutam.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/zijevazalonu.pdfIn PDF document text
    • http://lecostationery.com/files/file/8126535951.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/fiduro.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/97448480481.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/85527865398.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f5e9a6c370b9dab28a1b64489c381654/22614695492.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/nisebomap.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/nepovefuxi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/848f07bce222944226c9213549000f48/bagutetijetu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/35048978975.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e408d69c0707b0c6d874447fe3a40f05/tobosubalajatonorigagomuz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0595bb2ddc---88020301909.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/temeponimuluwigozufilakol.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/500b38b9546b8d7be11d3291312ab7be/93867214987.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4msq19m449pnspghjckjbi5opt/radurewufavumolus.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce55d89ae---junikaga.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/betavipixata.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/mawuzaxaribomodow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 17280 bytes
SHA-256: 023e1575e63aac0d2347660cd163f689a5973bd45fb7f554b9badc62d96cb961
font_02_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11344 bytes
SHA-256: 5860b1745acd296c1d72d6c76b86e581043891ac7a3d909847540f553ce5ab9b

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