Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8be46cd57bcc5…

MALICIOUS

PDF

108.8 KB Created: 2021-06-26 23:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9c6eac2119901b635e3829e52163c87 SHA-1: 72c7f15861d641745a3f259320545eeb844cd2c3 SHA-256: ecb8be46cd57bcc517c7426efe1dcc5ad34f9101e5d5f7362e7fab6cd6b599ad
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://oniceh.ru/uplcv?utm_term=rambunctious+meaning+in+english
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/j75obdmea5v2eqd863pp9ut5g4/57010825461.pdf
    • http://brainbond.ro/userfiles/file/zapifalobuxupaminalabumo.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dbcccfbf7---69652948701.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2917d3352---mibomupifaz.pdf
    • https://amd-export.com/site/upload/file/gudiloma.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52784e65a---85645404623.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd3140e05117c1f17dd7ca7152140631/25848766832.pdf
    • http://vasvaripalmuzeum.hu/upload/file/wizomowepup.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7adfb5bc6---61634066430.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd5c4d6644510c4043641675bbfd062b/kulubakeditexumokofo.pdf
    • http://orrizon.ru/images/file/xirosikadapa.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6fd2381b96fddf6a76e26403d95c62df/43528170873.pdf
    • http://rszm88.com/upfolder/e/files/20210604210017.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a2288feee808fcceda5b7ed71c9f9815/ligudurugidikebuvepanarot.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747fc9be196---76790648856.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5aa44fb5b51fb8bb2ca03f4ae19620de/15442573737.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817eb79ec5a---53908591892.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979b37824cf---vafumojokuxebova.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8daf18fc28e34e650ac07ea69f7b4127/jujepufadigadinijelase.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/78b0e9693e43a392a1fdf98b29723986/mosarasemopofiz.pdf
    • http://beachhigh65.com/clients/879402/File/15371446039.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/sinebuwukunudufigo.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728027c6c05---fewupuvaro.pdf
    • http://graham1978.com/clients/79565/File/jotanugekafukemubigodixab.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8fb0fa1d269621e67ac4d31d57741384/60538466668.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011630.bin
82c84dca5a6d577810ac704f8dacc2be4a35b1aa0dda59d45d5c3d4e5e80d9d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11630 18852 bytes
font_00_sfnt_off0000fe1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 16792 bytes
font_02_sfnt_off000135b6.bin
90f10f507e6b258af9733a0364eca1edaa5c57cb4653ed7b48d755b6da17d712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 10860 bytes
font_03_sfnt_off00014ea1.bin
98e599aa3c6e9b9a9343b00dd498ba08a7da00b19b26d1e488fcd1829254483b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA1 27812 bytes
font_04_sfnt_off00019230.bin
d0694cf31ce6e67379361af2ff02f853d1769b488adaa2d5d81c153cde6031cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19230 4628 bytes

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