Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1370ec7aac495bd…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 16:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 743903d5469e4ca99e2d04d00d143bde SHA-1: 6201410c4c7823274315245b64732f562889d414 SHA-256: d1370ec7aac495bde58d640c812250a933e442bc6aa2211041b9bc513c66e66b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://igabana.com/upfolder/e/files/20210531234736.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bdb5cdac---52458862771.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4138f2a2---76092579877.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/selepidivugemexipij.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210611_B7A863DAFEB9FCDF.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/13821297148.pdfIn PDF document text
    • https://digireg.ru/upload/89711365605.pdfIn PDF document text
    • http://springbook.no/files/22417253668.pdfIn PDF document text
    • http://enricobarraco.com/files/73952303527.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8d63033d---44974820759.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/nogimoxado.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/sijozuziriku.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ddm4a48v0ebqp4bjj7tjq5knqb/mimefolidikikakow.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44b747f7b---xerobadawuzufogilowu.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/wulinase.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/87648495647.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/venuxomog.pdfIn PDF document text
    • https://reniuved.it/file/gomevepamumawugitujore.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bd62301753b7eea5521e1572788dfa48/87229125567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=whiteflies+on+basil+plantPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 16524 bytes
SHA-256: e6f19a0ac6c01be7130f7eeeb59d1da85c7f3192e2d5833e01acc3280fac3c19
font_01_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 10488 bytes
SHA-256: 21517d03e50c03d0f8992e7e4a9fa43af96a619bd0b6ed3fca214bc01c92af29