Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f27ba46a59b09da…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 23:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18464db27ca08a59643e6d8aa97b04a3 SHA-1: 269480cc4944df01a6f8233c68ca1eda64927b32 SHA-256: 9f27ba46a59b09da0904eab56b01fb72025cb587e369b35018139d67aee4665f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to disposable domains and compromised WordPress upload directories, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=3d+shapes+names+and+properties+worksheet PDF link annotation
    • http://erictex.com/ufiles/files/95528211637.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/480774390.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5522140584.pdfIn PDF document text
    • http://wych123.com/upload/files/84674252482.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8mfd6dnh3iclkpnh1q1hs38hju/70752613145.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ea7971aa01ce0d54acf57752730903e9/67492767865.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xedobexufufidajasudew.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64fe84e718---97444496704.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2e0171950f4825476de85f76e42a2e69/zuverejabud.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6b2d2f5cfa8dca972287dbedb52e6a5b/gogevo.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/ladakorix.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33a39bd8ba---pomiwuravoralazowomekekad.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/nixezumupuj.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b925c901a7637edfb91c55c6e1ee7980/pesewu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8gqfbi7hu4g33cmerikiqst635/ropanafomum.pdfIn PDF document text
    • https://electroagro.es/pub/files/76523767118.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/23589932508.pdfIn PDF document text
    • https://duvanco.be/docs/files/givepemanerisedetuxiz.pdfIn PDF document text
    • http://asfalon.com/__files/file/66539612912.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/niximiwipilati.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/fumelevufetinogo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/585t46mnti8kipu29t3m3jgtd6/bigopewanex.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/286c0d4fe720e2c575388c9fe2fcd36c/bifix.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/ridakir.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_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 10864 bytes
SHA-256: 1550c0016b155752d5948d852fa926fd64777d21c87f28756d71fc274871acaf
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16380 bytes
SHA-256: ac69bb36af491c214a2bbaf0f760b9d176d15f6cbd656aaa9955241e96b1655f

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