Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5a13317dbfb5aa…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 02:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c834eb1f2c9ef4f9a49b6058902a062b SHA-1: 03eeb20614271156504d28e6d1c2bba6a5dfd6a3 SHA-256: fa5a13317dbfb5aab33bbb658e75a62ed9198ceebdaf92d98717e8bf13aca345
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=2019+standard+tax+deduction+married+filing+jointly', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=2019+standard+tax+deduction+married+filing+jointly PDF link annotation
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/bd658fff248d1047a48f1663b69b50ba/50625060869.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3rtjtu06gauhue4s4tsdkk69tc/motodu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f4617d6f---27008524512.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/pagopej.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/wosirokenomagi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a84319ae214---loxan.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/47mik74mllmlv9msmtrgnp5u7p/wugejijoboditukesodobi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248030382b---64165885792.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/48392018740.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c6eae50---15203529619.pdfIn PDF document text
    • http://gptools.net/userfiles/file/78057802139.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/padirisapofixeli.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bopagukugejemotawezoj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/84830502068.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/29d6695ced902e0d3b0f0f441d0ea4a8/sareniz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/wagugerikijilusozamurimu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5861b418d468da734534b04871707cce/92436738390.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/76439871170.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ebfbf29ffd7bc2a1e99bcb11325bcc0e/44215265241.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8auij9729unn0bpdcb9gqeqglj/somavodi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3bf522180633c6761359366c1c4e8eae/sabujubixuwotagasumitene.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/52149209911.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/sonap.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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 16080 bytes
SHA-256: 48dfb59abcd8d6921cdbcc4fe8d50bb3865d4129d17e1ddf34b9be1b379851ba
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 11632 bytes
SHA-256: afcef38907b90387d4cd956f24115874caf5b387dfe327556582923161e3bf41

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