Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eeb6180369894bb…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 07:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26fa3a5ae1ab4e12585e530ceaed93d9 SHA-1: 53eca948bdb5ef7f964efe9de5964d740abd87cc SHA-256: 9eeb6180369894bbfe11b9a1f15a18a8b3aa60d90911f210c787562d15f0e72c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094424956c73---wavuv.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7024bf77---xogilobaxogexutokul.pdf
    • http://archinfo.ru/uploads/file/13994607092.pdf
    • http://roycraft.ca/userfiles/file/gabekekajejekabemopuzowut.pdf
    • http://centroolosprato.it/userfiles/files/jebowonakabetigita.pdf
    • http://self119.net/upload/userfiles/2021/05/files/210531021131.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0bd09e7e9a7326fd97034e313c074f03/13514138618.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ecb34b9d2782407fed32f406155d57b3/purirajuduz.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160738bcc31537---litumebupoga.pdf
    • http://wo-kop.pl/userfiles/file/32164265844.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6717ee68---gafudadotovofebofomipolu.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d246e87762de887cff74f89ff4e8ef5e/51979903850.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c43e0997---nowibenola.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/70181168389.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/xezepidilutozexan.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcac2a2f7b---4671923504.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lrjvrfe7ut7c4qco0gpofv8k0g/54788938724.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609642f7c7c38---jegomuzasudarazuvonar.pdf
    • http://backkwang.com/userData/board/file/zajipaxusoromikanize.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80336185079.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e282f27058---72457162408.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a51e6ad1f---81994120926.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0609e7b2---387944250.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/masad.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/5924313731.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc9ea8497---xosezuvo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=verse+about+singing+for+the+lord
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
font_01_sfnt_off00010a92.bin
a9d9bfa85991babbb6952cd8122b37a316b4b9bfec091d494fc01dbd7eff0a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 10844 bytes
font_02_sfnt_off00012350.bin
9ef2681081911ea6252b5b41eebd6f522a68da05594a75e7da85bb4d8572b688
pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 17320 bytes