Malicious PDF — malware analysis report

Static analysis result for SHA-256 375a4dcc1961a114…

MALICIOUS

PDF

79.0 KB Created: 2021-07-15 16:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a258d279607d45eb1372e4dd14849ca SHA-1: 76fd7f1ca8ff98a7729837b6414f748b96a7744f SHA-256: 375a4dcc1961a1146e222e2bf751e5d66a1eec587108ba44f034dd43655df325
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://kodcomputers.ro/2664/uploads/xoxijuboguzixup.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/02ca6480e8df59c10c796fe8ac16ade1/29689355194.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/16823306789.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/revekoduzuk.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/465f34647104d0be5d2c9ce319c42324/bemalawekixapedibasib.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/diwogum.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358511c54b---21104763707.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc530d217---28204213174.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f6f568e1b44addc7ace1f063c21864fb/88525676652.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/kekejuxuronorara.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/95610474994.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/57230589852.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pnac7hl3mnc56es27mljj82c1h/70342960459.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094c62976858---tijenesedu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dec5204060---41041712776.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/93068417424.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d3493e8e0---79030912982.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/fuvevaduxiwalotefa.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/kuzedilatowoxas.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d051c172---zoxulex.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/afa7a17a8b53db694568d4de6f28faf3/kesiwinuguxewalel.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vmc8ra3vpgfm6s58eepiu0sim1/viderunilinogadufuba.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d94c59e62632b9113f2203a41eeeb6e2/62178744204.pdfIn PDF document text
    • https://tomas-music.com/contents//files/lowudumatub.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/45220653198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=swords+and+souls+unblocked+games+66PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 16132 bytes
SHA-256: 2b19586d2fe9bd72e7b3def417fd56504299f8c1d068cc4e21e6c5f4d59db771
font_01_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 1928 bytes
SHA-256: 82dec79e985f7d47beac3fb7780cd477958dcbbb3605eaf3d3a52cb129c80e9f
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 11184 bytes
SHA-256: 49be33e8c4bc25acd0f16f1e9fee3696d9a6e0b8a60271ac9cdff7693c9691e4
font_03_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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