Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf5d0eccdf267db…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 662dd9bc90c4c5f1151edd789df582dc SHA-1: cf83fd0f01636a86240bf9e76ab9237c9078bf52 SHA-256: edf5d0eccdf267db2003c5d485afeb91a46b5462b58a8e64ff1ececc3fe8c7a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to improve search engine ranking for malicious sites or to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=colloquial+english+idioms+pdf PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l9hmtlsk923pcnhg5u23ig81j4/pisofokukiw.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c72684c9---fewukuwinajavizapiz.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/gitumirolotu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/40895599261.pdfIn PDF document text
    • http://htwy.com/upload/file/40104395063.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/sokoxojizivixujaji.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6869a1b3a---wojinobujotobe.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/pazefodagajenijemab.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/44301821006.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2dcb941c6---gevupakuzitulupemufeno.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e392346---23024531287.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd2725536---denon.pdfIn PDF document text
    • http://vucert.vn/uploads/files/zejodikoxobaraxak.pdfIn PDF document text
    • http://llux.vn/uploads/files/jizavopijevakavuguji.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/35077c0ee76704cefee775fd15836477/sojudenaxen.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/lumekusufabip.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd58ac40c97---pajebaponiwed.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/detenud.pdfIn PDF document text
    • https://suksesunited.com/contents//files/gisutidozurokidofas.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c8dec817048fbeb3190aea04a6c1fae8/78573750366.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e47d10d8bc1---68253065896.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d8373db9912ba9ab0f1da58c93fd9246/84940775665.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136961964bcd---vijupuboxewemig.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/05a0d5e5288a1351b52ec608f7f07773/66333834758.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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 18648 bytes
SHA-256: cfaf880ffb71eb423e4a3525e6601b8c91eb97d3d09c98ecf97fc4f4cf1e85f6
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 11024 bytes
SHA-256: 0748cde27434c742937c382a5836235b8f6fc55c4cd4e3bc0bbd2cf13c645f56

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