Malicious PDF — malware analysis report

Static analysis result for SHA-256 b111ddffbcb83271…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 23:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2c09505c1bf258b558c9b422bedb2d47 SHA-1: 78a2a0f3fe6f3565c74eed0ece6fbee1a93f6aa1 SHA-256: b111ddffbcb83271a62236f364317d073e80965656ec2ad6ee24f0e19d015adb
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS uploads and disposable hosting, combined with a heuristic for a visual download button, suggests a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, but the overall structure and linked URLs point towards an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36f5cc37---52109604825.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f70254252d---towatedojevo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087652d9e734---6729883303.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/mexidivufopipezasifivosix.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-20/20210620222639840975.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef8f47f40---tarexi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bo5vam275r6aifotdra9cmpac1/zomexegitom.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vojaguritiv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d97aaad1---45620540239.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/revibasodu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/puderorobajujoxuj.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tetufedekiboledug.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d9f37c05---49899760236.pdfIn PDF document text
    • https://ivanamihic.com//files/gapejiwotujoluk.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2jklkdrd71049qj7ppvne4v3e5/gafutojirutonebogolo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6b8848b7a476801ff586b6a8039c56f7/dulusaber.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/7978719251dd00b4a06d624564f6ab15/89173058290.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bobikamuxebujibikewakoxaw.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/81049254471.pdfIn PDF document text
    • http://ecole.ru/text/images/file/47568818223.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/jaliborozuvujoxorisosudat.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b503cefbe5626704ff8a2f99c06a4568/75576091421.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gudas.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d0dc79d4---serofuxavo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ed0775860cb0815c9efa14d8b9d682ed/gosobatevemekorukig.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/eb05b50295390acc8d11d0499b973aa3/gonuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=answer+of+sample+paper+2021+class+10+sciencePDF 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_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10904 bytes
SHA-256: 9bcea7016e7f4fe873b7609c9093ffbc5dce8b32d068d5b354b47a63729e1737
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16820 bytes
SHA-256: 7ea9f85b57e09c09024604392b3a96b27ce216b94925ad23d6075ecb25a8ce32
font_02_sfnt_off000138b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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