Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fdaddedab46bbe…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 10:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9d37fcb69bd5d2bea7999d82198d7411 SHA-1: 9b6607e4df8a845cc4bd4d9d67a1da65fac13454 SHA-256: 83fdaddedab46bbe4e3e0d71060d70ed0837550b28d8ffe6548fe08d9f85b408
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or distribute further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b1e391f2---64768855562.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c933e7eb4e7---jojuvave.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/roneze.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0032e86f11e46fccc0114b0aa17e4d02/69610291047.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/64e27830e628ccca0c97070340f94f99/8201160338.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cfa586a78854193c1994dd8302d63caf/45701712856.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd658116b0---vakebivadodarogavufona.pdfIn PDF document text
    • http://446888.top/userfiles/file/72849697365.pdfIn PDF document text
    • http://ahchala.com/img/file/zewagofefebovegunubufotif.pdfIn PDF document text
    • http://cke.hk/userfiles/sineli.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ac1122272554b6913bb07e94291b515b/36667401634.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f4c9c2cf8ae2cb8329ba7179329cff4c/forarepuma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948dd190eb8---binebinunalakovabilu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/sorub.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/rowevejip.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/43009312061.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a963162f346---pemomigegijokip.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bda83afb---80189453351.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dogugisenimosasadedesifi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/drelc2sqkskrbkej691bvu6rpb/23631858779.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bd64eb2148463a6150c1faafcffd2ba8/denudodefovewagejeritare.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607423068674b---winojotulakurawux.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709b3f5de96---69128300895.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/02biq6ro09rbuacl9vt9r55l4b/76677924740.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/wavulurapevewa.pdfIn PDF document text
    • http://nensi.si/upload/file/melam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=puzzle+teasers+with+answersPDF 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_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 17724 bytes
SHA-256: 3a0e456ae7c34b9d5f9ad6f5e25b0301ba71098f03cd709b2ee1b28b5814f36a
font_01_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 10332 bytes
SHA-256: aa33ca396cefc0c57e02dd69970cc378b090db0ec20f23de895ed2effe066517
font_02_sfnt_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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