Malicious PDF — malware analysis report

Static analysis result for SHA-256 31722b1f67283aa2…

MALICIOUS

PDF

87.9 KB Created: 2021-06-11 11:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 85caf05184f3724f66dfcb87abbf4a4e SHA-1: a3960bbbb79bd4c6c66e94ddb91c8d82aa183fe5 SHA-256: 31722b1f67283aa2621ec1f3344cf4339434b6f69c3bbedcf30731d3430be36a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://inwebjor.ru/uplcv?utm_term=audio+cutter+apk PDF link annotation
    • http://brukbet.com/user_images/file/vavifosiv.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xurizodonexeromas.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3eebefda772c2322d05aa1842243ea26/9880875803.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f019d6838e---43682700257.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1014b6a91---xisotugafavalipawifukopi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/89ffbd2cd34d0d5d6cdc9c4905c4fa55/13095444206.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92bbd1952---lijumuzutifuxita.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u9u4krguhl5vavfdvgva1afdpo/vagosuger.pdfIn PDF document text
    • http://huntland.hu/upload/file/dozifexumazefe.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/dorexirad.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8ro3gohm1qpkplongrd19i6ss1/58642959052.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9823f840---62859705305.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4ec68c9---72004760882.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/91a8c91fb3fada505178d0cac81c523c/73474033298.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4cc092ef8c5ef24fda6fb6d4bf5bf386/88713640589.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/kewavilumub.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/71414600729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 4688 bytes
SHA-256: 95d6145ba7eef154ea5101e93867dfbea1251df50402f3ddd8efdd025b699fbd
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 3488 bytes
SHA-256: ce8752ef655cb5c986828cfadcc8db703c89f1fbf894f0346c5a599e3b1d569e
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 12096 bytes
SHA-256: 3122f2b87b92e363596f3927d698138a6cbd88b3b1b1b66c05532895aa7017c5
font_03_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 16652 bytes
SHA-256: 09e4904cf9748c9a8a4a84f06851a622b13510824d5057d0d098397ab63ad3b8
font_04_sfnt_off0001429d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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