Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eefb1b67bef8864…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 15:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f027d3bdf4464458fc70a9cd5e2ae58 SHA-1: f8da193e2549690f78f8ca2c3717b01127725e7b SHA-256: 6eefb1b67bef886454c26aae1a1ab9f936cfd31908b4db61ad9980b18b3a009f
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The primary purpose appears to be a link farm, likely used for SEO manipulation or to distribute further malicious content, rather than delivering a direct payload via script execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=magnificat+pdf+bach PDF link annotation
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172399fee8---58179860856.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5b963fff---42909503316.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8be883d5---39684111401.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c342c9df744---69714113604.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/jibukolix.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/76072904968.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zibutosemodulepijiwim.pdfIn PDF document text
    • http://abwessex.com/uploads/files/85916927486.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/52664488842.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/56109387918.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec21ee2ef5---xukibojadimijurarim.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582c92fc7f---lesoxodupisapowuxasifomuz.pdfIn PDF document text
    • http://amandamaitland.com/images/file/16231575353.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5e43266e21844cfe907e3d6877d160c9/pasepajixiwuninesewofi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7c0769947cc3c70be59cbc8671222dc/demorav.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/pamapafepilugawukigoxape.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/sivuwabo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3703f09c---4493524550.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/vigifi.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/87609983125.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702631d807a---munegomepef.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/88278340989.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/5c2dbjd840djqt2ahsnd3s99c7/81506044712.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/83456756311.pdfIn PDF document text
    • http://chemicalengineers.ie/images/77864031957.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/caa37aad0a8d8367faa7187ffa90a70a/wofavijonofejixufipide.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 17984 bytes
SHA-256: 88e28010d10638a660de36276c4fdb8659b0a96c7206cd84d0ccb1f5fe1b3238
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 10468 bytes
SHA-256: e74a4513480e863cd9a027ec9c81432f502f107060e9aa854a1dddb07052e924

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