Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e39c2d9501608d4…

MALICIOUS

PDF

80.6 KB Created: 2021-07-15 20:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2b752ccbab6e51154ec0391ceef4a6ee SHA-1: 543669760ad4a5ca74e0b1ab84e9517384201eca SHA-256: 4e39c2d9501608d4137a8e009b932b4c44d7ca5d55bf5a44775887751aea8da0
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests a distribution or redirection mechanism, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ingpoggi.eu/userfiles/files/67680362365.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505193132359629.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/61674742556.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/10d971165335b134d97a7af9435b21df/dobalapitofutosogejali.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/73549983443.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/4535855539.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b18bcb6f2998d1f2a20f71c02a1b90d3/61017815482.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tesegopavebopil.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0994086ccb---43796327411.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c4db019e---tiguma.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/28702059927.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/063f296f5732872acb371413cb4fcb55/fugatapobikodumanavufema.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/f8d7c858e47dfabac1d6fddef6e2b520/turizesegi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f592259b---vevubikadubizoki.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/xebojen.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/vibuwapoponapat.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607124536462f---wenisofi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sf4ih0f7666gmeogpu15aj3d85/watobikodosa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a8ed40e7---texuxikitofu.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/basapomakisafojalivatub.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/urtt5d7i5ti0svgrpqihhbu6i5/79902191217.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e582e03986---31623073673.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/72522455333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cracking+the+coding+interview+6th+edPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4e0f878aeb038f7c78065c136928047f/92583461761.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 10880 bytes
SHA-256: 86b96190c118da544c955f2ec97cffcdecb3c2673eab6a8061c1e4fc973c6690
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17168 bytes
SHA-256: fe729fa3235f8c7615bfab36b5f41a7d8fae2e8b9db4bd2441a40f45734065e8
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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