Malicious PDF — malware analysis report

Static analysis result for SHA-256 1601801a390bc3c3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 01:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a84a855b5081ee7400f66785fc589bbe SHA-1: b1c881b550505cf75273b8056a39dbc7c2ec7be5 SHA-256: 1601801a390bc3c35de3f351cd8375d913c794c3f1ec6fb5e3ed6056ef834609
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised websites or disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection confirms this assessment, identifying the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=chemistry+class+12+ncert+text+pdf PDF link annotation
    • https://anfauglir.com/images/file/rinazarisefeminoliposa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945af64be3---verinisotago.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f27128c00---jogitinatog.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77eb125284---48735021145.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/75077572205.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/44412746928.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/89750790329.pdfIn PDF document text
    • http://4bx.pl/public/file/28616603518.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d3d460d44af95d9de517f104ae505a3a/31972908162.pdfIn PDF document text
    • https://85097781.com/upload/files/xakudirerolegaxuguzixakig.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca0f830df---95401518532.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/70533462133.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/06d366020a20ecebbce988920d6e3aed/vekevitavoxowepetat.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/muveperigi.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/foxagenigawakutitoze.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/54032867638.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/74333460507.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46563568822.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/37049695500.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a294d8c19---zowugajes.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210716_073334.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4357fc2347ac07d7e263f9dc9c7103c4/xezori.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/19517205859.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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 19864 bytes
SHA-256: af17d550643c47712d064787ee87a3fdfbdd06f4f11b174b064e1d6dccaea436
font_01_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 11184 bytes
SHA-256: 2b1256f6d4d13523c9d52a0082c84140027d5d6909f00b17e392300d9a7ddb17

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