Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6166a86abe6f4f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 18:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf387b9a303e45f4a02ab74da5afa7b2 SHA-1: 71a4993809d622fbe2b9c847e25cc911b97cf25b SHA-256: 0e6166a86abe6f4f245cdd17fc13f01d13586758b03532c6dd135c7429a463af
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on what appear to be compromised CMS uploads, suggesting it functions as a link farm. The presence of these links and the overall structure point towards a phishing or SEO spam campaign.

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 http://orderkai.com/uploads/files/36726184234.pdf In PDF document text
    • http://baocaosuhoatoc.com/luutru/files/puragotevebixomukulizigot.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1c258ea536d0a2b30f024b52432f44c8/zuxixofinoz.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rekosofimurubifizo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/baxuw.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fexagapifok.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/26823702142.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac5601246---waxebafilazu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/h356trl4ljt3it4jvr8d32htas/galumi.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210625184241_y0o8uj.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842653d999d---jalisopanuro.pdfIn PDF document text
    • https://ijpdua.com/contents/files/refurar.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee131d885---xasibe.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ced734559083d18a662f489462f069dc/voxexiturojasaliworenuta.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12207208369.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f672f903---gujowukuroxuwabanivababi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d6f44d8f55cb72a82d5e09a095f264ff/56234654130.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36134838883.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a1321f7069302d685411fc567f7a00ae/21342241210.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/35c30b14d0bbae49f613f4fe07bbf654/66463776358.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/jc9e8btcr5b2taejrc8ccmtmpi/85226261205.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/12434052077.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e7ec56607511861602820bcb6c9a65dc/88076339473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+resueltos+de+absorbancia+y+transmitancia+pdfPDF 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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 20096 bytes
SHA-256: fa36540a5842f467e63d287f6d876c76afcffced81930aa81a777ca5607e1984
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 11248 bytes
SHA-256: 9b72b09e059f7d08910a3c564f7e718327feab3426cc5e139c28dc29f12d3c49

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